单项选择题

The boy looked at the stranger carefully, ______ who he could be.

A．to wonder
B．wondering
C．wondered
D．having wondered
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单项选择题
One and a half ______ ______ left on the table.
A．apple ... is
B．apples ... are
C．apple ... are
D．apples ... is
单项选择题
It was the man ______ yesterday,
A．which I talked to
B．what I talked with
C．I talked
D．that I talked to
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