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My parents are going to buy a new TV______two months.( A )

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My parents are going to buy a new TV______two months.( A )
A,in B,after C.for D,before
为什么不能选B呢,
in +时间段:与将来时连用 (此题正是如此)
after +时间段:与过去时连用
after +时间点:可与将来时连用
He will be back in two hours.
He came back after two hours.
He will be back after two o'clock.
in+一段时间表示将来时
如:I'll come back in a week
in+一段时间也可用于过去时,意思是”...内”
如:he came in two days.
而after+一段时间通常只能用于过去时,不能用于将来时
如:he came back after a week