Mary ___ some songs in her room in the morning.A.heard sing B.heard to sing C.was heard sing D.is heard to sing为什么?

Mary can s___ some Chinese songs. He asked ___ Mary could sing some songs in the party.正确答案是A,B为何不可?A.ifB.when Mary ___ some songs in her room in the morning.A.heard sing B.heard to sing C.was heard sing D.is heard to sing为什么? Mary sings pop songs best 同义句 Mary is___ ___ pop singer Mary sings English songs well ,so ___.A.Jane does B.does JaneMary sings English songs well ,so ___.A.Jane does B.does JaneMary sings English songs well .So___.A.Jane does B.does Jane Some of Grace's best ___(love) songs are clooected in this CD mary loves to sing songs 对 to sing songs 提问 Mary is good _______ singing songs. some well listening songsEnglish songs tell me some English songs 改为同义句 Mary likes to sing Chinese songs mary _____ ______ Chinese songs Mary has some friends We like ___(This) English songs. She can'tt ___(sing)American songs give me some good English songs,please. we can ()some songs ()Music lessons they can sing some songs的意思 He can sing some songs 肯定回答