关于since It's almost three years____I last saw her.A.since B.when C.that D.after答案是选A,但不是说since 只能用于完成时的吗?此题做何解释呢?

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• 关于since It's almost three years____I last saw her.A.since B.when C.that D.after答案是选A,但不是说since 只能用于完成时的吗?此题做何解释呢?
• for +一段时间用什么提问,还有since回答用什么提问
• 选用since或for填空1.We have learned five lessons ____ the beginning of this term.2.Mrs Liao has been in hospital ____ last week.3.I have stayed at my aunt's ____ two weeks.4.He has studied very hard ____ he came to our school.5.We've been waiting ____ 20 minutes.