— Has Jack finished his homework yet —I have no idea; he ____ it this morning.
（A）was doing
（B）had been doing
（C）has done
（D）did
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更多大学英语单项选择题库试题
- 1Although I had read the book assigned by the professor several times, it didn't make any__ to me. –固定短语搭配 make sense to somebody
- 2— Hello, could I speak to Don please — ___________
- 3The word “ridiculed “in paragraph 3 most likely means_____________
- 4—It is said that another new car factory ____ now.现在进行时的标志词 — Yeah.It _______ one and a half years.-正在建，说明将要花费一年半的时间
- 5Here’s my card, Let’s keep in ___.
