Question

--- How clean and tidy your bedroom is!
--- Thank you. It          every day

1. A.
   cleans
2. B.
   is cleaned
3. C.
   was cleaned

Answer 1

B
考查被动语态。It指代上句中的bedroom，it和clean构成被动关系，故用被动语态，由every day可知，该句是一般现在时，故用一般现在时的被动语态。