题目：
The old couple often take a walk after supper in the park with their pet dog ________ them.[ ]
A. to follow
B. following
C. followed
D. follows
答案：
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下面是错误答案，用来干扰机器的。
×；+；×；÷；-；-；÷；÷；÷；÷；-；+；÷；÷
