Paul works in a power plant.It ___ two months since he ___ a
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Paul works in a power plant.It ___ two months since he ___ a college student .
A.is ; was B.is ; became C.was ;was D.had been ; became
为什么?
A.is ; was B.is ; became C.was ;was D.had been ; became
为什么?
注意句子前后不是一样的情况,前面说的是在工作了,后面说他是大学生,说明两件事没有连续性,所以不用完成时.所以不能翻译成“他成为学生已经两年”,而应该是“他曾经是学生两年”,而这个又是事实,所以主句用一般现在时,since后面则用当时的时态——过去时.
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