1.I know Mr.Brown;we____to each other at an international conference.
A.are introduced B.are being introduced C.were introduced D.were being introduced
2.I think much attention____your pronunciation.
A.should be paid of B.ought be paid by C.must pay to D.should be paid by
拜托各位了~!这些都不太明白意思...拜托解释以下啦~还有告诉我怎么填,为什么就好了~谢谢~!