单项选择题

They recommended () smaller heating and cooling systems.

A. to use
B. to be used
C. being used
D. using

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单项选择题
In other word, () we were witnessing rapid population growth, that would not mean that the countryside were filling in with people.

A. now that
B. even that
C. just as
D. even if
单项选择题
The thief caught on the spot by the policeman denied ()anything.

A. to do
B. to have done
C. do
D. doing
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