She was just about to explain ______ she hadn’t passed her maths test chiefly out of carelessness ______ her uncle came.

A．her mother, when                                       B．to her mother why, that

C．her mother that, when                                 D．to her mother that, when

答案

D

【详解】

考查固定短语、宾语从句和固定句型。句意：她正要向母亲解释她数学考试不及格主要是由于粗心，这时她叔叔来了。第一空，根据短语explain to sb.“向……解释”后跟不定式，且后文为宾语从句，从句中不缺少成分应用that引导，故第一空填to her mother that；第二空为固定句型sb. be about to do sth. when…“某人正要做某事，这时……”，故第二空填when。故选D。

【点睛】

用when引导时间状语从句的句型结构搭配：

1.sb. be about to do sth. when “刚要/即将正要做某事，突然……”

2.sb. be doing sth. when “正在做某事突然……”

3.sb. had done sth. when “刚刚做过某事突然……”

4.sb. be at the point of doing sth. when “就在做某事的关键时刻，突然……”

5.scarcely...when/hardly...when “几乎未来得及就……；刚一……就……”