选择题(try的用法,all的短语)
1.He couldn’t open the front door, so he tried _______ the backdoor.
A.pushing B.to pushC.to pushingD.and push
try doing 和do很难区分啊
SARS and Bird Flu are new to us hunman eings; we won the fight against them,______.
A.in allB.after allC.above all D.at all
为什么不是D呢