题目内容

61（）

A. although
B. whether
C. since
D. that

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"Have you made the hotel reservation" "Not yet, but I ______."

A. ought to have
B. need have
C. had to have
D. would have

It's time that we ______ proper measures to protect the environment.

A. take
B. are taking
C. took
D. have taken

交换机的结构有3种形式，( )不属于交换机的结构形式。

A. 独立型
B. 总线型
C. 堆叠型
D. 模块化

66（）

A. falls
B. removes
C. results
D. comes