问题补充：
A new library downtown. They hope to complete it by the end of this year.
A. is being built
B. has been built
C. will be built
D. is building
答案：
(答案→)A. is being built
B. has been built
C. will be built
D. is building
解析：考查时态和语态。由提供的信息“They hope to complete it by the end of this year”他们希望今年底可以完工，可知,图书馆应是正在（被）建设中，故用现在进行时的被动语态。选A。
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