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witness瞬间动词吗?witness是瞬间动词还是延续动词?thelasthalfofthenineteenthcenturythesteadyimprovementinthemeansoftravel.a.haswitnessedb.waswitnessedc.iswitnessedd.witnessed选A还是D?

题目详情
witness瞬间动词吗?
witness是瞬间动词还是延续动词?
the last half of the nineteenth century ____ the steady improvement in the means of travel.
a.has witnessed b.was witnessed c.is witnessed d.witnessed
选A还是D?
▼优质解答
答案和解析
A,延续动词