应该选 A
现在完成时 +since +一般过去时
自从上周她来北京以来她妈妈就病了.
Her mother has been ill（ ） she came to Beijing last week A.since B.as C.until D.When
Her mother has been ill（ ） she came to Beijing last week A.since B.as C.until D.When
英语人气：430 ℃时间：2019-09-27 12:47:44
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