单项选择题

________ a good thing they didn't catch you.

A．That's
B．There's
C．It's
D．What's
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单项选择题
I am ________ of the same old breakfast every morning.
A．worn out
B．tired
C．ill
D．exhausted
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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