问题

“Did you hear someone knocking at the door?” “Yes, I did. I heard him______three times.”[ ]
A: knocking
B: knocked
C: being knocking
D: knock
B: knocked
C: being knocking
D: knock
正确答案是:
同类题型
Are you free next week—-I don’t think so. These days I’m very_________.
u sure you won’t come for a drink with us —-_________, if you insist.
She _______ live with her parents, but she doesn’t now.
Tom, ______ Jane and Rose, ________ goingto the farm on foot.
It remains to be seen _______the newly formedcommittee’s policy can be put into practice