Rarely ________ such a silly thing.

1.   Rarely ________ such a silly thing.

A. have I heard of 

B. I have heard of  

C. I have been hearing of  

D. have I heard from

Rarely ________ such a silly thing.

A. have I heard of

B. I have heard of

C. I have been hearing of

D. have I heard from

Rarely ________ such a silly thing.

1. A.
   have I heard of
2. B.
   I have heard of
3. C.
   I have been hearing of
4. D.
   have I heard from