20. He began to __________ because every means _______ tried already.

 A. lose heart; has been   B. lose heart; had been

 C. lose his heart; was    D. lose his heart; had

B


解析:

 選B。try發(fā)生在began之前，所以用過去完成時。lose heart 意思是“灰心，失去信心”；而lose one’s heart to意思是“愛上某人”。

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