_______ he met with the difficulty did he realize the importance of our help.A．
题型：不详难度：来源：
_______ he met with the difficulty did he realize the importance of our help.| A．Even though | B．Never until | | C．Only before | D．Ever since |
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答案
| B |
解析
| 此题考查从句的引导词。根据主句是倒装did he realize可以排除A、D两项。如果选C项，则主句应该用过去完成时态had he realized,因而被排除。 |
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