单项选择题

Written applications should be sent to us in case ______ some problems with the electronic version.

A．there will be
B．there is
C．there be
D．there was
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The manager has his employees ______ a business report every week.
A．to write
B．written
C．writing
D．write
单项选择题
No sooner had they got the goods covered up ______ it started raining hard.
A．when
B．than
C．then
D．after
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