问题补充：
He was so busy that he couldn’t help the experiment.
A. doing
B. do
C. did
D. done
答案：
A. doing
(答案→)B. do
C. did
D. done
解析：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。
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时间：2020-02-07 10:11:29
He was so busy that he couldn’t help the experiment.
A. doing
B. do
C. did
D. done
A. doing
(答案→)B. do
C. did
D. done
解析：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。
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