来自李伟东的问题
Thereisabigblackboard_________theclassroom.A.inthefrontB.infrontofC.inthefrontof.最好加些infrontof与inthefrontof的区别.
Thereisabigblackboard_________theclassroom.
A.inthefrontB.infrontofC.inthefrontof.
最好加些infrontof与inthefrontof的区别.
