It was not until near the end of the letter she mentioned her own plan.A. thatB. whereC.

问题补充：

It was not until near the end of the letter she mentioned her own plan.

A. that

B. where

C. why

D. when

答案：

(答案→)A. that

B. where

C. why

D. when

解析：句意：“直到信的末尾，他才提到自己的计划。”这是强调句型——因为去掉it was/is…that…剩下的还可以组成一个完整的句子。强调句型一般由it was/is+被强调的部分that（人或物）/who（只能用来强调人）+其余部分。

【考点定位】考查强调句型。一般出现了it was/is的时候我们都要先考虑一下强调句型，强调句型最大的特征就是去掉it was/is…that…剩下的还可以组成一个完整的句子。