问题
Experts suggest that teenagers spend at least 30 minutes exercising, five times a weekWalking and riding your bike _____ , and ______
A:counts; so are school sports
B:count; school sports count, either
C:count; so do school sports
D:counts; so school sports do
B:count; school sports count, either
C:count; so do school sports
D:counts; so school sports do
正确答案是：
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