问题:
________ does Lin Feng usually clean the floor of his own bed-room? Once a week.
A.When
B.What day
C.How long
D.How often
________ does Lin Feng usually clean the floor of his own bed-room? Once a week.
A.When
B.What day
C.How long
D.How often
A.When
B.What day
C.How long
D.How often
参考答案: