Question

【题目】You had better _________ the teacher for help when you have questions.

A. askingB. askedC. askD. to ask

Answer 1

【答案】C

【解析】

句意：你有问题的时候最好向老师求助。A. asking 动名词/现在分词；B. asked过去式/过去分词；C. ask动词原形；D. to ask动词不定式。根据空前had better可知，had better后面一定要接不带to的动词不定式,即动词的原形，此空故填ask,故选C。