单项选择题

But as a matter of fact, I did not begin to work ______ he had gone.

A．until
B．although
C．since
D．if
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单项选择题
The enemy was surrounded in the valley and it was difficult to ______.
A．break off
B．break away
C．break through
D．break out
单项选择题
By the time you get there tomorrow, the film ______.
A．will start
B．is starting
C．will have started
D．is to start
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