单项选择题

This magazine is of great ______ to the students of chemistry.

[A] valuable
[B] value
[C] important
[D] useful
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单项选择题
Professor Yang, together with some of his students, ______ in the reading room.
[A] was reading
[B] were reading
[C] be reading
[D] reading
单项选择题
Since you have broken the law, you won't escape ______.
[A] punish
[B] punishing
[C] punished
[D] being punished
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