单项选择题

I don't know ______.

A． who is he
B． who he is
C． he is who
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单项选择题
______ water is left in the bottle
A． How many
B． How much
C． How
单项选择题
In the office you will see the sign ______ .
A． No Parking
B． No Photos
C． No Smoking
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