单项选择题

I am an engineer, ______ I

A．aren't
B．amn't
C．are
D．am not
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单项选择题
The foreigner showed us ______ an English composition.
A．what to write
B．how to write
C．to how write
D．how write
单项选择题
There was nothing they could do ______.
A．but wait
B．except waiting
C．only to wait
D．unless they waited
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