Question

This morning, when I walked by, I saw many children ____ in the park.

A. played
B. play
C. playing
D. to play

Answer 1

答案C
本题的含义是今天早晨当我路过的时候，我看到许多孩子在公园玩，对于我在走当时，看到孩子们应该正在玩，see sb doing sth表示看某人正在做某事，故选C。