单项选择题

________ he will come or not is unknown.

A．If
B．Whether
C．That
D．What
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单项选择题
When she was busy tidying the room, her little kid is always________.
A．under way
B．on the way
C．in the way
D．by the way
单项选择题
Sorry, I don't know he is a friend of________.
A．your brother
B．your brothers
C．your brother's friend
D．your brother's
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