题目内容：

一道关于try to do和try doing用法的英语题!
No body answer the front door.So he tried ____ at the back door.
A.to knock B.knock
C.knocked D.knocking
应该选择哪个?

优质解答

选D,因为这个人是为了要进去才敲门的,敲门只是一种手段,try to do sth是指为了达到某目的,try doing sth是指通过尝试这个动作而达到某目的,EX：He tries speaking more English to improve his grade.=He tries to i...