— can a tiger weigh do you know? — Yes I know that a big one can weigh over 300 kilos.

问题补充：

— can a tiger weigh, do you know?

— Yes, I know that a big one can weigh over 300 kilos.

A. How many

B. How heavy

C. How much

D. What

答案：

A. How many

(答案→)B. How heavy

C. How much

D. What

解析：句意：你知道一只老虎有多重吗？是的，我知道大的一只可以超过300千克。根据后面的weigh over 300 kilos可知，是询问老虎的体重的；故选B。