问题

First, gradually increase a gentle walk to 20 minutes. This can be done every day or _____.

A:every another day
B:every other day
C:every other days
D:every the other day;

正确答案是：

同类题型

English is _______ important subject, so we must learn it well.

I called you yesterday afternoon, butthere was no reply.—I ______ a dolphin show the zoo with mycousins.

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_______ good for our health.