Question

【题目】You are so __________ your car.

A. silly not have locked

B. silly not to have lock

C. silly not to have locked

D. silly not to lock

Answer 1

【答案】C

【解析】考查“形容词+动词不定式”的用法。句意：你没有锁车，真是太傻了。根据句意可判断，应该用have locked表示过去没有锁车。to lock表示将来的事情。