Question

Please clean out the house as anon as possible.

1. A.
   clean up
2. B.
   clean down
3. C.
   clean the inside of
4. D.
   clean the outside of

Answer 1

C
clean eth out意为“将某物内部清理干净”；clean sth up意为“清理掉某物”；clean sth down意为“擦净某物”，故原句中的clean out可用C项替换。