Question

17.(2013 天津，38) —I don't know       .

—Because he has to look after his mother.

   A. why he is leaving       B. why is he leaving

   C. whether he is leaving   D. whether is he leaving

Answer 1

17. A

17. A

句意:——我不知道他为什么要离开。——因为他不得不照顾 他的妈妈。本题考查宾语从句。由答句可知问句是问“为什么”， 排除C项和D项。因为宾语从句要用陈述句语序，故排除B项。 故正确答案是A项。