____ we have finished the course, we shall start doing more revision work.
A. For                  B. Now that          D. By now           D. Until
B
分析句子意思可以知道，該句為原因狀語從句，選項(xiàng)C、D不符合題意。選項(xiàng)A表示原因，不可放在句首，故應(yīng)選A項(xiàng)"既然，由于"。
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