We wou1dn't lose heart even if we（）again.

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问题 We wou1dn't lose heart even if we（）again.

选项 A.wou1d fail
B.failed
C.had failed
D.fail

答案B

解析句意:即使我们再次失败，也不会丧失信心。主句用 “would +动词原形”，从句用一般过去式。

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