现在完成时 since 能否去掉比如I have learnt maths since 2 years ago可改为I have learnt maths 2 years 还有这道题He said that he had met her two years——.A.before B.ago C.for 2 years D.since 2 years agoHe said that he had met her t
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![现在完成时 since 能否去掉比如I have learnt maths since 2 years ago可改为I have learnt maths 2 years 还有这道题He said that he had met her two years——.A.before B.ago C.for 2 years D.since 2 years agoHe said that he had met her t](/uploads/image/z/7340257-1-7.jpg?t=%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6+since+%E8%83%BD%E5%90%A6%E5%8E%BB%E6%8E%89%E6%AF%94%E5%A6%82I+have+learnt+maths+since+2+years+ago%E5%8F%AF%E6%94%B9%E4%B8%BAI+have+learnt+maths+2+years+%E8%BF%98%E6%9C%89%E8%BF%99%E9%81%93%E9%A2%98He+said+that+he+had+met+her+two+years%E2%80%94%E2%80%94.A.before+B.ago+C.for+2+years+D.since+2+years+agoHe+said+that+he+had+met+her+t)
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