单项选择题

We all feel sorry for ______ for so long after your arrival.

A．keep you waiting
B．having kept you waiting
C．waiting for you
D．keep you wait
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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
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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