单项选择题

Please remember to keep in ________ with me through e-mail when you are abroad.

A．touch
B．trouble
C．promise
D．approval
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单项选择题
________ they change the coach they will lose the match.
A．Until
B．Before
C．Unless
D．Although
单项选择题
He is the only one of the students who ________ finished the task in time.
A．have
B．has
C．is
D．are
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