---- Has Sam finished his homework today
题型:选择题
问题:
---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A.did
B.has done
C.was doing
D.had done
---- Has Sam finished his homework today?
---- I have no idea. He ________ it this morning.
A.did
B.has done
C.was doing
D.had done