单项选择题
No sooner had we reached the top of the mountain ______ we all sat down to rest.
A. when
B. then
C. than
D. until
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单项选择题
Neither Mary nor her brother ______ good at singing.
A. is
B. are
C. is not
D. are not
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单项选择题
I don't think it advisable ______.
A. your studying maths
B. you to study maths
C. for you to study maths
D. of you to study maths
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