单项选择题

She didn’t go to the party last night,（）she had to finish her term paper.

A. if
B. though
C. till
D. because

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单项选择题
This problem is（）his ability and I don’t think he can solve it.

A. to
B. in
C. beyond
D. under
单项选择题
how long does it take to go to Australia by ship（）

A. Thirty days.
B. Three weeks.
C. Twenty days.
D. Two weeks.
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