When Jane fell off the bike,the other children ___.

When Jane fell off the bike,the other children ___.

题目
When Jane fell off the bike,the other children ___.
A.were not able to help laughter
B.could not help but laughing
C.could not help laughing
D.could not help to laugh
答案
C. could not help laughing.第一句不对因为help 和laugh 都是动作动词(action verb)第二句不对因为but是个clause,需要一个动词(laugh),而laughing是一个participle. Participles是通常当gerunds或者modifiers用....
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