单项选择题

I' m not surprised you failed the exam. You （）have worked harder.

A. should
B. must
C. would
D. ought

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单项选择题
She had heard strange footsteps in the house several times, so she hired a private detective （）to the matter.

A. go into
B. put into
C. look into
D. take into
单项选择题
（）, the professor is still trying to learn a new language.

A. However he is old
B. Old as he is
C. He is as old
D. As old he is
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