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。