—What did Mr. Smith do in the middle of the night?—Well, I’m not sure, but he was often heard _______.
A.singing the same song B.to sing the same song C.sing a same song D.to be playing same song正确答案A
—What did Mr. Smith do in the middle of the night?—Well, I’m not sure, but he was often heard _______.
A.singing the same song B.to sing the same song C.sing a same song D.to be playing same song正确答案A
