单项选择题

You can't drink alcohol（）you are at least eighteen years old in some states of the US.

A. if
B. unless
C. though
D. when

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The situation today is obviously different from（）it was about 30 years ago.

A. what
B. when
C. which
D. such

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Yesterday Ms. Chen at the meeting suggested that Li Hong（）the job because she is the only one qualified.

A. does
B. will do
C. do
D. done

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