问题描述：
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 ago
He said that he had met her two years——.
A.before B.ago C.for 2 years D.since 2 years ago
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 ago
He said that he had met her two years——.
A.before B.ago C.for 2 years D.since 2 years ago
问题解答：
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