Question

I don’t know _________ she always looks down upon me．

1. A.
   why is it which
2. B.
   why it is that
3. C.
   who is it which
4. D.
   what it is that

Answer 1

B
本题为强调句的特殊疑问句作宾语，疑问句作句子成分时要用正常语序，本题表示原因。