问题补充：
-Don step on the grass next time, Mike.
-.
A. Is that so?
B. Don worry.
C. I don know.
D. Sorry, I won
答案：
A. Is that so?
B. Don worry.
C. I don know.
(答案→)D. Sorry, I won
解析：句意：Mike，下次别踩在草坪上了。A这样的吗？B不用担心；C我不知道；D对不起，我不会了。结合语境选D。
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