问题补充：
It is reported that many a new house at present in the disaster area.
A. are being built
B. were being built
C. was being built
D. is being built
答案：
A. are being built
B. were being built
C. was being built
(答案→)D. is being built
解析：考查时态：句意：据报道很多新房子现在正在灾区被建造。时间是at present，说明是正在被建，而且主语是many a+可数名词单数，谓语是单数，选D。
