We spend about an hour a day ________ .
题型:选择题
问题:
We spend about an hour a day ________ . [ ]
A. do our homework
B. doing our homework
C. do our homeworks
D. to do our homework
We spend about an hour a day ________ . [ ]
A. do our homework
B. doing our homework
C. do our homeworks
D. to do our homework