i'm busy now,so i can't help __your bike.A repairing B to repair C repaired D being repaired哪个呢?为什么?

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i'm busy now,so i can't help __your bike.A repairing B to repair C repaired D being repaired哪个呢?为什么?
i'm busy now,so i can't help __your bike.
A repairing B to repair C repaired D being repaired
哪个呢?为什么?

i'm busy now,so i can't help __your bike.A repairing B to repair C repaired D being repaired哪个呢?为什么?
Help to do是帮助某人做某事help doing是忍不住做某事,所以选to repair

B to repair
help sb do帮助某人做某事

B

选B,can't help doing是忍不住要做某事,或不禁要做某事.此处只有B合乎语法/语境.

B
"can not help to do sth"表示对做什么事情爱莫能助,

a
help doing (帮忙做)
cannot help (doing) 不禁, 忍不住, 不得不

B
"can not help to do sth"表示对做什么事情爱莫能助,而,can't help doing是忍不住要做某事,或情不自禁做某事,这里是因为忙,爱莫能助的意思,所以只能选B