问题补充：
单选题Hebeganto__________becauseeverymeans_______triedalready.A.lose heart; has beenB.lose heart; had beenC.lose his heart; wasD.lose his heart; had
答案：
B解析try发生在began之前，所以用过去完成时。lose heart 意思是“灰心，失去信心”；而lose one’s heart to意思是“爱上某人”。
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