单项选择题

It was essential that a meeting ______ this week.

A．must be convened
B．would be convened
C．be convened
D．was convened
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单项选择题
Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which ______affects the circulatory system.
A．in turn
B．in return
C．turn back
D．as a result
单项选择题
He said it was impossible for ______ a mistake in a computer's calculation, so you can rely on that.
A．there being
B．there would be
C．there to be
D．there was
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