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
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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
单项选择题
Only 11 people ______ the shipwreck.
A．survived after
B．survived through
C．were survived
D．survived
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