These boys haven't made up their minds_______.
问题描述:
These boys haven't made up their minds_______.
A.when to start B.when starting C.when they start D.when started这题应该选A吧?
答
没错,应该选Awhen to start 做宾语疑问词 + to do 相当于疑问词 + 从句动词不定式( to do )可以和疑问词 what, which, who, whom, how, where, when 等连用,构成不定式短语.此结构具有名词的性质,在句中可充当主语...