He came back home in April,by which time his grandfather ___

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He came back home in April,by which time his grandfather _____ （）
A、had passed away
B、passed away
C、had been passed away
D、was passed away
但是我选B,为什么就不能理解成是：“他的外祖父是在以前的某一年的这个时候死的”呢?

选A没错.
这道题要注意by which time修饰的是哪句话,因为这里有which,所以是这个time是一个定语,修饰的是前一句“He came back home in April”的,而不是修饰“his grandfather.”的.
所以He came back home in April是从句,而his grandfather.才是主句.
by the time 接时间状语的时候,从句要用时间点,而主句要用相对应的完成时,这里的从句he came back是过去时,所以主句要用过去完成时,因此选A.
翻译为：他四月份回来的,那时（他回来时）,他爷爷已经死了.而并不是说“他爷爷死的时候,他已经回来了”.

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