单项选择题

They were at work when they received ______ SOS from ______ school, and they immediately started their police cars.

A．the,the
B．a,a
C．an,a
D．the,a
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单项选择题
______ more attention, the young trees could have grown much letter.
A．To give
B．Given
C．Giving
D．Having given
单项选择题
The middle-aged lady surrounded by the masses is said ______.
A．to be, main
B．being, main
C．to be, chief
D．being, chief
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