A.shouldn’tfollow B.mustn’tfollow C.couldn’t have been following D.shouldn’t have been following
A.to stay B.stayed C.stay D.having stayed
A.any topic B.which topic C.whichever topic D.the topic he thought it
A./；the B./；/ C.the；/ D.the；the
A.made convenient B.made it convenient C.made it convenient for D.made it convenient to
