8．Since 1994，the glacier in Antarctica has lowered by as much as 90cm，______________sea level to rise．（　�。�
A．having causedB．causingC．causedD．being caused

分析 自從1994年，南極的冰蓋已經(jīng)降低了多達(dá)90厘米，這就造成了海平面的上漲．

解答 答案：B．根據(jù)the glacier in Antarctica has lowered by as much as 90cm（南極的冰蓋已經(jīng)降低了多達(dá)90厘米）可以看出sea level to rise是必然的結(jié)果，所以選擇B causing．由于 caused 不發(fā)生在lowered 之前，所以不能選擇A having caused．

點評 考查現(xiàn)在分詞做狀語．現(xiàn)在分詞有幾種形式：一般式doing，表示其動作與謂語動詞的動作同時發(fā)生；
完成式 having done 表示其動作在謂語動詞的動作之前完成；
被動式being done表示其邏輯主語為現(xiàn)在分詞動作的承受者

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