问题

Though ____ the dangers of smoking to their health, smokers still find it hard to give up smoking.

A:aware
B:aware of
C:are aware of
D:be aware of

正确答案是：

同类题型

ering his health, I advise him to_____an hour or two each day to work out.

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_____ is better to love than _____ .

Let’ s have oranges. — ________.

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