题目内容

I'll stay here _______ everyone else comes back.

A. even if
B. as though
C. because
D.until

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Hard-working though he was, ________ there was never enough money to pay the bills.

A. /
B. and
C. but
D.therefore

Much hard ________ he tried, he failed to catch up with the first runner.

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

I would never speak to someone like that ________ they said something unpleasant to me.

A. even if
B. so that
C. as if
D. ever since

单片机AT89C51要使用自带的ROM存储器，则EA引脚（）

A. 必须接地
B. 必须加+5v电源
C. 可悬空
D. 以上三种视需要而定