.____by his expression,he must have got "A" in the exam.

问题描述:

.____by his expression,he must have got "A" in the exam.
A) Judging B) Judged C) Having been judged D)to be judge

A) Judging
Judging by/from 根据…来判断 ,是固定搭配.
无论逻辑主语发不发出这个动作,都是用Judging这种形式.