The smiths----in the park at 6:00p.m yesterday .

问题描述:

The smiths----in the park at 6:00p.m yesterday .
A.walked B.are walking C.was walking D.were walking 这题的语法点怎么解.

首先,yesterday表明用一般过去时态,而又给了六点这个具体时间,所以应该用过去进行时,was walking