题目内容

He was so busy that he couldn’t help ____________ the experiment.
A．doingB．doC．didD．done
B

试题分析：考查固定词组。Can’t help doing sth情不自禁做某事；can’t help do sth不能帮忙做某事；句意：他如此的忙以至于不能帮助做实验。故B正确。
点评：Can’t help doing sth情不自禁做某事；can’t help do sth不能帮忙做某事；
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