问题补充：
—Mary works hard at English.
— and.
A. So does she; so you do
B. So does she; so do you
C. So you do; so does she
D. So she does; so do you
答案：
A. So does she; so you do
B. So does she; so do you
C. So you do; so does she
(答案→)D. So she does; so do you
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