单项选择题

Don' t be that serious; he is a（）child.

A．fair
B．mere
C．rare
D．slender

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单项选择题
Gases are not like solids（）they have an infinite volume.

A．at that
B．with that
C．for that
D．in that
单项选择题
The second book was（）by August 1982, but two years later, the end was still nowhere in sight.

A．completed
B．to have completed
C．to complete
D．to have been completed
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