题目内容

网络最短路问题和网络最小树问题实质是一个问题。

A. 对
B. 错

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When we were kids, we went to Beijing for our holidays, but I _______ there for years.

A. have not been
B. am
C. have been
D. had been

We lived in Hunan from 1995 to 2001, but we _______ to Hainan now.

A. have moving
B. have moved
C. moved
D. was going to move

They did not come to our party yesterday, even though we ________them special invitation.

A. sent
B. send
C. had sent
D. were sent

I was late for the film. It ______ half an hour before.

A. was starting
B. has start
C. starts
D. had started