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____ we have finished the course, we shall start doing more revision work.

A. For                    B. Now that          D. By now            D. Until

B


解析:

分析句子意思可以知道,该句为原因状语从句,选项C、D不符合题意。选项A表示原因,不可放在句首,故应选A项"既然,由于"。

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[  ]

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