题目内容

We had scarcely left our school _______the rain began.

A. before
B. than
C. while
D. when

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We have never seen her again ________she went to work in another city.

A. when
B. as
C. since
D. while

______the fight stopped, travel across the country has been quite safe.

A. Since
B. When
C. After
D. Unless

They were just about to leave _______the telephone rang.

A. before
B. when
C. as
D. than

一个具有 A、 B、 C 三个逻辑变量的逻辑函数 Y=AB+AC+BC 是它们的最小项表达式。

A. 对
B. 错