单项选择题

He was busy writing the essay all the morning, only ()occasionally to have a cup of tea.

A. breaking off
B. breaking out
C. breaking
D. breaking away

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单项选择题
An investigation that is () can occasionally yield new facts, even notable ones, but typically the appearance of such facts is the result of a search in a definite direction.

A. timely
B. unguided
C. consistent
D. subjective
单项选择题
An embarrassing blunder nearly () his career before it got off the ground.

A. eradicated
B. blighted
C. decayed
D. deteriorate
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