Jack does his homework Mary. So they both always get good grades in the exams.A. so caref

问题补充：

Jack does his homework Mary. So they both always get good grades in the exams.

A. so careful as

B. as carefully as

C. so carefully as

D. as careful as

答案：

A. so careful as

(答案→)B. as carefully as

C. so carefully as

D. as careful as

解析：短语辨析。句意：杰克做作业和玛丽一样细心。因此他们俩在考试中总是取得不错的成绩。as···as之间加adv或adj，表示和……一样。本题修饰动词，故用副词，选B