He was so busy that he couldn’t help ___...

He was so busy that he couldn’t help ____________ the experiment.

A．doing

B．do

C．did

D．done

B 【解析】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。考点：考查固定词组

考点分析：

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