A. Both healthy and unhealthy groups have increased blood pressure.
B. Both healthy and unhealthy group has increased blood pressure.
C. Both healthy group and unhealthy group have increased blood pressure.
我覺得C應該一定對
但不知道A跟B到底哪個才正確？
因為兩個好像都有看過
Thanks

A

A

A，兩者皆是，動詞用複數。如果是either or,neithernor,not only but also句型才是動詞跟某個主詞變化

C is wrong.

A

C哪裡wrong?

C的第一個group 會變成是冗詞贅字，文法上其實也沒特別太大的錯誤。