单项选择题

That ______ the case, we have to make some changes in our plan.

A．is
B．was
C．being
D．has been
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单项选择题
The energy gained from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.
A．precede
B．proceed
C．progress
D．practice
单项选择题
This detective story might not be ______ interesting to keep the child awake.
A．enough
B．adequately
C．amply
D．sufficiently
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