Fill in the gap with the most appropriate option from the list following the gap.

The old man couldn't help ...... at his grandson's babbling?

  • A to laugh
  • B that he laughed
  • C laughing
  • D in laughing

The correct answer is C. laughing

laughing as a present participle tense, is the action of the verb "to laugh" the sentence is in the present continous tense 

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