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？