—Tom is so joyful that he smiles at everyone.—So you if you get the first in the exam.A.

问题补充：

—Tom is so joyful that he smiles at everyone.

—So you if you get the first in the exam.

A. do

B. are

C. would

D. will

答案：

A. do

B. are

C. would

(答案→)D. will

解析：

句意为：——汤姆如此高兴以致于见人就笑。——如果你考试得了第一，你也会这样。条件状语从句(if...)若用一般现在时，则主句要用一般将来时；此句相当于：You will also be so joyful if you get the first in the exam.。