Living in the desert involves a lot of problems，water shortage is the worst.A. of whichB.

发布时间：2020-08-16 08:41:11


Living in the desert involves a lot of problems，    water shortage is the worst.
A. of which
B. when
C. of whose
D. Which

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(答案→)A. of which
B. when
C. of whose
D. Which
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