Which of the following italicized parts indicates cause？A．The sailors were at the mercy of
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Which of the following italicized parts indicates cause？
A．The sailors were at the mercy of the wind and waves.
B．He declined the invitation on the ground of a previous engagement.
C．In the classroom, he found Jack on the point of departure.
D．Harry achieved his goal by force of determination.
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正确答案：B
句子功能题。[A]的斜体部分意思是“任凭风浪摆布”；[C]的斜体部分意思是“正要离开”；[D]的斜体部分意思是“凭借决心”。[B]的斜体部分意思是“由于先前已有约会”．因此含有因果关系，所以正确答案是[B]。