单项选择题

To reduce weight, plastic has taken ______of iron and steel in making boats.

A．its place
B．place
C．the place
D．a place
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单项选择题
I’m sure he understands ______you feel. He’s very clever.
A．when
B．what
C．whether
D．how
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
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