单项选择题

The police ______ for the thief everywhere when he suddenly appeared in a theatre.

A．search
B．have searched
C．were searching
D．are searching
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单项选择题
The class ______ doing experiments on heat and light in the laboratory, and this afternoon this class ______ going to have its picture taken.
A．is; is
B．is; are
C．are; is
D．are; arc
单项选择题
I was ______ in the middle of my call because I had no more pennies to put in the box.
A．broke in
B．cut off
C．hung up
D．put down
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