问题补充：
The building which now will be our science laboratory.
A. is being built
B. will be built
C. is built
D. has been built
答案：
(答案→)A. is being built
B. will be built
C. is built
D. has been built
解析：考查时态。根据语境可知建筑物正在被建筑，故用现在进行时的被动语态，选A。
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