单项选择题

Mary will not be relieved ______ David has been taken to the safety.

A．if
B．when
C．unless
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单项选择题
Simon sat in the chair, ______ without a word.
A．smoked
B．smoking
C．who was smoking
单项选择题
Lydia can recognize ______.
A．whose is that car
B．whose car that is
C．whose car is that
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