Of all the subjects chemistry seems to befor me.A. difficult B. too difficultC. more diff

问题补充：

Of all the subjects, chemistry seems to befor me.

A. difficult

B. too difficult

C. more difficult

D. the most difficult

答案：

A. difficult

B. too difficult

C. more difficult

(答案→)D. the most difficult

解析：考查形容词比较等级，由比较范围of all the subjects可知：用最高级形式。