He is busy preparing for the speech,so he cann’t help_____th

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He is busy preparing for the speech,so he cann’t help_____the experiment with us
He is busy preparing for the speech,so he can’t help_____the experiment with us.
A.carry out B.carrying out C.carried out D.with carrying out
为什么选A.
我知道can't help to do sth 表示不能帮忙做某事,我觉得这里是不能帮忙做某事,为什么省略了to?
Weather_________(permit),we’ll go to the countryside and enjoy the fresh air.
为什么填permitting,为什么要用-ing形式？

HELP 后的动词不定式可省去TO,一定要记住,又如
He often help me (to )clean the floor.

He is busy preparing for the speech,so he cann’t help_____th He is busy preparing for the exam的同义句英语翻译1.\x05他正忙着准备面试.（busy）He is busy preparing for the interv He is ___ to leave at ten so he is busy preparing. 1.He didn't pay ________ to the speech so he missed the main .He is so busy,so he won't _____________ ________ __________ He was so busy that he couldn't go to the concert.（改成同义句)He Is Mr.Green really busy these days?( ) He's busy preparing s He is always so busy that he has little time for his friends ..50分1._______,he sat up late preparing the opening speech f he was so busy that he couldn't goto the concert.改为同义句怎么改? He was so busy that he couldn't go to the concert.（改成同义句)