单项选择题

The young trees ______ before they grow up.

A． must be taken good care of
B． may take good care of
C． should taken good care of
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单项选择题
I must first to find a room ______.
A． to live
B． to live in
C． living in
单项选择题
Hearing what the boss said, we all look at him ______.
A． with surprise
B． at surprise
C． in surprise
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