单项选择题

Although ______ happened in that developed country sounds like science fiction, it could occur elsewhere in the world.

A. which
B. what
C. how
D. it
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单项选择题
Living in the central American desert has its problems, ______ obtaining water is not the least.
A. of which
B. for what
C. as
D. whose
单项选择题
You ______ yesterday if you were really serious about the job.
A. ought to come
B. ought to be coming
C. ought to have come
D. ought have come
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