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
There ______ a pineapple and two bananas on the dinner table.
A．is
B．are
C．were
单项选择题
The boutique (时装店) issued (发布) a recruitment (招聘启事) ______ more assistants to attend customers.
A．on
B．for
C．with
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