Why pleasant smells do not reduce pain in man is a question still _______ by scientists.
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A
answered
B
being answered
C
to be answered
D
that answered
推荐题目
Much attention should be paid _________people’s living conditions.
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A
in improving
B
to improve
C
improving
D
to improving
—Why does the lake smell terrible? —Because large quantities of water _____.
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A
have polluted.
B
is being polluted.
C
has been polluted.
D
have been polluted.
If the project ________ by the end of this month is delayed , the company is sure to pay a large sum of money for it .
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A
completed
B
completing
C
to be completed
D
having completed
Many people prefer large cars, __________________large cars are safer than small ones.
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A
thinking
B
to think
C
think
D
having thought
In New England, I made lots of friends ______ a very practical knowledge of the English language.
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A
get
B
to get
C
getting
D
got