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

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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
单项选择题
At the meeting there was a hot argument and so many problems were left （）.

A. to solve
B. solving
C. solved
D. unsolved
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