The new system needs to be in operation for five months ________ it can be upda
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The new system needs to be in operation for five months ________ it can be updated.| A．as | B．while | | C．before | D．once |
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答案
| C |
解析
| C考察状语从句。本句的before用语肯定句中，强调主句动作持续的时间比较长，意为：要多多久….才。故C正确。 |
举一反三
________ it is, the boy never seems to be able to finish it off.| A．However interesting a book | | B．Whatever interesting a book | | C．How interesting a book | | D．What an interesting book |
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Steve was busy clearing the cups and dishes from the table ________ others were playing.| A．until | B．if | | C．since | D．while |
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You seem to have a readymade answer ________ I ask you a question.| A．whenever | B．whatever | | C．whichever | D．whoever |
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—I don"t mind how you do it ______ you finish the painting on time.
—OK, I see.| A．as well as | B．as far as | | C．as long as | D．as fast as |
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—Was it 11 o"clock ________ your father came back last night?
—Yes, he is always coming back so late.| A．that | B．while | | C．when | D．until |
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