Question

【题目】I was really scared and I didn't know ___________ when I saw a snake that day.
A.how to do
B.when to do
C.where to do
D.what to do

Answer 1

【答案】D
【解析】考查疑问词+不定式, 选D。根据句意：那天当我看到蛇时，我真的很害怕，不知道怎么办。A. how to do怎么做...... B. when to do什么时候去做，C. where to do哪里去做，D. what to do做什么，怎么办。注意A、B、C后要跟宾语语义才完整。 此题极易误选为A。