Roger had just walked into his office and that was when he was told that his plan had fin

Roger had just walked into his office and that was when he was told that his plan had finally been approved. Which of the following can be instead of the underlined(划线的) part to make the sentence better.
A. and then they told him
B. when it was learned by him
C. and then he learned
D. when he learned

A. and then they told himB. when it was learned by himC. and then he learned(答案→)D. when he learned解析：考查when的用法：when当…时候，也可以是“这时”相当于at that time，可以构成had done…when…这个固定结构，意思是：刚刚做完…这时…,用when更加简洁。句意：Roger刚刚走进办公室，这时他知道他的计划最后通过了。选D。

我明天再问问老师，叫他解释下这个问题