单项选择题

His attention often () at lectures, no wonder he failed the exam.

A．branched
B．wondered
C．wandered
D．went out

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单项选择题
He did not tell his parents because he knew they would try to change his mind but he ()in a colleague at work.

A．involved
B．joined
C．engrossed
D．confided
单项选择题
It was a bold idea to build a power station in the deep valley, but it ()as well as we had expected.

A．went off
B．worked off
C．broke off
D．came off
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