David didn’t give up ______ he had failed in the experiment four times．A．ifB．whi
题型：不详难度：来源：
David didn’t give up ______ he had failed in the experiment four times．| A．if | B．while | C．though | D．since |
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答案
| C |
解析
| 此题考查连词，though引导让步状语从句，表示尽管。 |
举一反三
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