试题与答案

Millions of pounds’ worth of damage ____

题型:选择题

题目:

Millions of pounds’ worth of damage _____ by a storm which swept across the north of England.

A.has been caused

B.had been caused

C.will be caused

D.will have been caused

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:考查可待因的结构特征。结构中无酚羟基而吗啡有。故本题答案应选C。

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