He has been practicing ___ English for two hours.
问题描述:
He has been practicing ___ English for two hours.
A.speak b.to speak c.speaking d.spoke
答
He has been practicing (c.speaking) English for two hours.
他已经练习说英语两个钟头了.
practise doing,练习做某事.要用动名词形式来当宾语.