单项选择题

David had been there for nearly an hour. He didn't know ______ to wait or go home.

A．if
B．neither
C．whether
D．either
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单项选择题
You may move out any time you want to because you are old enough to live ______ you want.
A．why
B．when
C．where
D．what
单项选择题
--Can you speak Russian--I can speak a little, ______ I can't understand much.
A．and
B．or
C．otherwise
D．but
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