They were surprised that a child should work out the problem ________ they thems
题型：不详难度：来源：
They were surprised that a child should work out the problem ________ they themselves couldn"t.| A．once | B．then | C．While | D．if |
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答案
| C |
解析
while（implying a contrast）含相对之意，表示对比转折。 |
举一反三
A computer can only do ________ you have instructed it to do. |
You should try to get a good night’s sleep_________much work you have to do.| A． however | B． no matter | C． although | D． whatever |
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The changes in the city will cost quite a lot, ___________they will save us money in the long run. |
_______________you call me to say you’re not coming, I’ll see you at the theatre.| A． Though | B． Whether | C． Until | D． Unless |
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Several weeks had gone by____________I realized the painting was missing.| A． as | B． before | C． since | D． when |
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