The students couldn’t help while watching the TV play. [ ] A.laughingB.to laugh
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![The students couldn’t help while watching the TV play. [ ] A.laughingB.to laugh](/pic/43_949530.jpg)
The students couldn’t help ________ while watching the TV play.
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A.laughingB.to laughC.laughing atD.to laugh at试题答案
答案:A