Question

If you ______ not to tell anyone else, I _____ you how much I paid for it.

1. A.
   will promise; tell
2. B.
   promise; will tell
3. C.
   will promise; will tell
4. D.
   promise; tell

Answer 1

B
由If可知此句是一个含有条件句的复合句。主句谓语动词用一般将来时，条件从句的谓语动词用一般现在时表示将来。