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