问题补充:
Mr. Smith couldn’t open the door because his naughty boy it from the inside.
A. would lock
B. was locking
C. has locked
D. had locked
答案:
A. would lock
B. was locking
C. has locked
(答案→)D. had locked
解析:句意:史密斯先生打不开门,因为他淘气的儿子从里面锁上了。表示发生在过去的过去,故用过去完成时,选D。
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