专四

单选题 A man escaped from the prison last night. It was a long time __________ the guards discovered what had
happened.

A．before
B．until
C．since
D．when

参考答案：A进入在线模考


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1 Not only__________ people to send words, music, and codes to any part of the world, it can also be used to communicate far into space.

A．enabled by radio
B．radio enables
C．does radio enable
D．has radio enabled

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2 My pain__________ apparent the moment I walked into the morn, for the first man I met asked sympathetical-ly: "Are you feeling all right?"

A．must be
B．must have been
C．had been
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3 __________ we have all the materials ready, we should begin the new task at once.

A．Since that
B．Since now
C．By now
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