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Over the past l00 years，sea level      steadily as a result of global warming．
A．had increasedB．has been increasingC．increased D．is increasing
B
考查時態(tài)，句意：在過去的100年中，作為地球變暖的結(jié)果海平面一直在穩(wěn)定的上升�？芍揪涿枋龅氖乾F(xiàn)在已完成的一直在進行的動作，故用完成進行時態(tài)。選B。
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