Question

---Don't open the door for him, ________ who knocks at it．

---No problem．You've told me about it several times．

1. A.
   instead of
2. B.
   as if
3. C.
   no matter
4. D.
   as

Answer 1

C
no matter意为“无论”，引导状语从句。题意为：无论谁敲门，都不要为他开。