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单项选择题

Before we left the room the chairman made sure ______ the lights were turned off.

A．if
B．which
C．when
D．that

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热门试题

单项选择题Receiving a letter was so costly that ______.

A．a congressman calculated it as worth a bushel of wheat
B．Meg Austrian became a historian of the U.S. Postal Service
C．mailing could become a means of venting anger
D．people tended to write as little as possible

单项选择题Which of the following is the desirable characteristic of lab meat

A．It should be nice-looking and long-lasting.
B．It should be easily available in supermarket.
C．It should look and taste like the traditional meat.
D．It should be a cure for bird flu and mad cow disease.