Read the sentence and choose the right time marker. ______ we skated in the park.

The sentence describes a past action. The options provided are time markers for past events. 'Yesterday at 4 pm' and 'From 4 pm till 5 pm yesterday' are specific past times. 'Last week' is also a past time frame. All options are grammatically plausible. Without further context or a specific emphasis on duration or exact time, any of these could fit. However, if the intention is to select a single, specific past event, 'Yesterday at 4 pm' is a common and direct choice. If the intention is to indicate a duration, 'From 4 pm till 5 pm yesterday' would be appropriate. 'Last week' is a broader timeframe. Given the blank space at the beginning, it implies a single time marker. The most common and direct choice for a single past event is 'Yesterday at 4 pm'.