Since this road is wet and slippery this morning,it __________ last night．

A．must rain

B．was raining

C．must have rained

D．may rain

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参考答案

【参考译文】今天早晨路上又湿又滑，昨晚肯定下雨了。
【答案解析】本题考查情态动词+完成时的用法，表示对已经发生的事情作肯定的猜测，如：I didn’t hear the phone．I must have been asleep(我没有听见电话铃响，我肯定睡着了)。

1 Evidence came up __________ specific speech sounds are recognized by babies as young as 6 months old．

A．where

B．that

C．which

D．what

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2 With the bridge __________ ,there was nothing for it but to swim．

A．was destroyed

B．destroying

C．being destroyed

D．destroyed

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3 __________ is well known,the key to success lies in hard work．

A．As

B．That

C．Which

D．What

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