Questions and exercises are given by the computer, which decides ______ to move
题型：不详难度：来源：
Questions and exercises are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.| A．either, or | B．both, and . | C．whether, or | D．not only, but also |
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答案
| C |
解析
| Whether---or·---表选择。问题的给出是为了决定是提高水平还是做同一水平的题。故选C。 |
举一反三
Hearing his words ,I couldn’t decide _____or remain .| A．whether to go abroad | B．if I go abroad | | C．if to go abroad | D．to go abroad |
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____he thought he was helping us with the work, he was actually in the way. | A．Although | B．Unless | C．Because | D．When |
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—When did he leave the classroom?
—He left _____you turned back to write on the blackboard.| A．the minute | B．the time | C．until | D．before |
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Jack had traveled six miles across the Channel _____his engine failed and was forced to land on the sea . | A．when | B．until | C．after | D．since |
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Not that I’m unwilling to lend you a hand , ____I’m too busy for the moment .| A．because | B．but that | C．but | D．however |
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