单项选择题

__ the radio, he began to go over his lessons.

A．Turning off
B．Turned off
C．Turn off
D．Having turned off
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单项选择题
Because of my poor English, I’m afraid I can’t make myself
A．understanding
B．understand
C．understood
D．to understand
单项选择题
__, he had to leave school.
A．Since his father’s unemployment
B．Since his father was unemployed
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