单项选择题

I’m sure he understands ______you feel. He’s very clever.

A．when
B．what
C．whether
D．how
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单项选择题
John______he could improve his exam results, but he did not have enough time to study.
A．knows how
B．knows that
C．knew how
D．knew that
单项选择题
Without electricity human life ______ quite different today.
A．is
B．will be
C．would have been
D．would be
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