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doing ; doing to do ; to do to do ; do do ; doing
finish doing to finish doing finishing to do finishing doing
So do I. So am I. So I do. So I am.
one and half hour one and a half hour one and half hours one and a half hours
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go shopping going shopping do my homework doing my homework
did my homework am doing my homework do my homework was doing my homework
finishing to do to finish doing finishing doing finished
B.C.D.四个选项中，选出可以填入空白处的最佳选项。 — What did you do last night, Bob? — First I did my homework, and then I played ______ piano for half ______ hour. A.the；a /；an the；an a；the
doing homeworks doing homework to do my homework do homework
So do I. So am I. So I do. So I am.
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