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【单选题】
The two friends _____ on the Internet for three hours, and they would go on till the next morning.A.
had been chatting
B.
had chatted
C.
were chatting
D.
has been chatting
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反馈参考答案：
举一反三
【简答题】How many cyclists will take part in the tour?
【简答题】痰液标本的采集时机:一般以____为好。
【单选题】How many companies were involved in producing the hydraulic part for the film Titanic?
A.
Three.
B.
Only one.
C.
Two.
D.
Four.
【单选题】How many companies were involved in producing the hydranlic part for the film Tianic?
A.
Three.
B.
Only one.
C.
Two.
D.
Four.
参考解析：
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