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英语语法:为什么选b?不是since后用过去时吗?()somemorecasesofH7N9havebeenfound,moreresearchhashasbeendoneonit.A.WhenB.SinceC.IfD.Whether
题目详情
英语语法:为什么选b?不是since后用过去时吗?
( ) some more cases of H7N9 have been found,more research has has been done on it.A.WhenB.SinceC.IfD.Whether
( ) some more cases of H7N9 have been found,more research has has been done on it.A.WhenB.SinceC.IfD.Whether
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答案和解析
Since 后面不一定是接过去式的,since可以接完成时态,表示自……以来,并且以后还会这样
这里表达的是 自从H7N9案例被发现以来,更多的研究在这方面展开了
这里表达的是 自从H7N9案例被发现以来,更多的研究在这方面展开了
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