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题目内容
（黑龙江省教育学院口语(专升本)）
(单选题)
Has Jack finished his homework yet?
I have no idea; he ____ it this morning.（）
(本题3.5分)
A、 was doing
B、 had been doing
C、 has done
D、 has done
Has Jack finished his homework yet?
I have no idea; he ____ it this morning.（）
(本题3.5分)
A、 was doing
B、 had been doing
C、 has done
D、 has done
参考答案