Choose the correct form of the verb. ... the government ... a new museum in 2019?

The sentence describes a completed action in the past (2019). Therefore, the past simple tense is appropriate. The verb 'open' is transitive in this context, meaning it takes a direct object. The correct form is 'opened'. The auxiliary verb 'did' is used for questions and negatives in the past simple, but here we need a statement. 'Was' is used with the passive voice or as a linking verb. The correct combination is 'did open' if it were a question, or 'opened' as a simple past verb. Considering the options, 'Did, opened' is incorrect as it mixes an auxiliary with a past participle. 'Was, open' and 'Did, open' are grammatically incomplete or incorrect for a statement. 'Was, opened' would imply a passive construction, but the government is the subject performing the action. The most fitting option, though not perfectly phrased as a statement, is to complete the sentence with a past simple verb. If this were a question, 'Did the government open...' would be correct. Given the options, and assuming the blank is for the main verb, 'opened' is the correct past tense form. However, the options provided are pairs. Let's re-evaluate. The sentence structure implies a question: 'Did the government open a new museum in 2019?'. If so, the correct pair would be 'Did, open'. If it's a statement, 'The government opened a new museum in 2019.' The options are 'Did, opened', 'Was, open', 'Did, open', 'Was, opened'. The most logical interpretation for a question is 'Did, open'. If it's a statement, none of the pairs perfectly fit. However, if we consider the possibility of a passive voice statement, 'The government was opened a new museum' is incorrect. Let's assume it's a question. Then 'Did, open' is the correct choice. The question asks to choose the correct form of the verb, implying filling in the blanks. The structure '... the government ... a new museum in 2019?' strongly suggests a question. Therefore, the auxiliary verb 'Did' and the base form of the verb 'open' are needed. The correct answer is Did, open.