单项选择题

This is the reason ______ an airplane can fly in the sky.

A． why
B． which
C． for that
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单项选择题
The soldier______, but when he saw the captain he______.
A． sang... was stopped
B． sang... stopped
C． was singing... stopped
单项选择题
Give me a hand, ______
A． will you
B． don't I
C． don't you
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