Kate asked the girl to ________ so that she could hear what her husband said on the phone.
| A．slow down | B．come down |
| C．settle down | D．break down |
答案 :
C
The professor devoted all his life __________ the treatment of AIDS.
| A．to research |
| B．in researching |
| C．to researching |
| D．at researching |
答案 :
C
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