—Hi, Mary. It never entered my head that

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问题选择题

—Hi, Mary. It never entered my head that you’d come. What a surprise!

—I’m on a business trip in the city and I ______ in on you.

A．dropped

B．drop

C．had dropped

D．have dropped

答案

答案：D

选择题

Having checked the doors were closed, and ______ all the lights were off, the boy opened

the door to his bedroom. [ ]

A. that

B. why

C. when

D. where

填空题

铸铁的补焊按是否预热可分为（）和冷焊法。