问题补充:
The new bridge by the end of last month.
A. has been designed
B. had been designed
C. was designed
D. would be designed
答案:
A. has been designed
(答案→)B. had been designed
C. was designed
D. would be designed
解析:考查时态和语态。本题的根据是抓住by的用法,by与完成时连用,本题后面的时间是过去的时间,故使用过去完成时。句意:到上个月结束时为止,这座新的桥梁已经被设计出来了。根据句意说明B正确。
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