the days in summer are longer than [ ]in wintera one b those c that d these.

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the days in summer are longer than [ ]in winter
a one b those c that d these.

选 B

those

选B
that 和 those 可指代前面提到的事物,这里the days为复数,所以用those。
these是this的复数,one用于指代前面提到的事物中的一个