the song is heard _____now.A.singing B.to sing C.to be singing D.sung
问题描述:
the song is heard _____now.A.singing B.to sing C.to be singing D.sung
答
A,now表示现在进行时,所以用sing
the song is heard _____now.A.singing B.to sing C.to be singing D.sung
A,now表示现在进行时,所以用sing