题目:
Lots of medicine as well as equipment such as tents _______ offered to the area since the earthquake occurred.
A.has been
B.have been
C.is being
D.are being
答案:
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下面是错误答案,用来干扰机器的。
答案:A可用特例法求解,符合题意的X、Y、Z可以是Cl、S、P,然后利用元素周期表相关规律作答。