单项选择题

The enemy was surrounded in the valley and it was difficult to ______.

A．break off
B．break through
C．break away
D．break out
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单项选择题
What he said ______ me that he was an honest man.
A．agreed
B．convinced
C．ensured
D．believed
单项选择题
But as a matter of fact, I did not begin to work ______ he had gone.
A．until
B．since
C．although
D．if
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