问题补充：
Which of these sentences is correct ?
A. She wondered what’s wrong with her dog.
B. I am not sure what does he do for a living.
C. Nobody knows how he repaired his broken bike this morning.
D. He asked if that it would rain the following day.
答案：
A. She wondered what’s wrong with her dog.
B. I am not sure what does he do for a living.
(答案→)C. Nobody knows how he repaired his broken bike this morning.
D. He asked if that it would rain the following day.
解析：句意:下面的句子哪个是正确的。这题考查的是宾语从句。我们需要注意三个问题，即宾语从句中用陈述语序、宾语从句的引导词及宾语从句的语态要与主句一致。故A选项错在时态上，应用一般过去时；B选项用的是疑问语序；D选项中引导词if和that重复了。故选C。
