问题补充：
Pleaseforget your homework. You are supposed to hand it in tomorrow moming.
A. aren
B. haven
C. don
D. didn
答案：
A. aren
B. haven
(答案→)C. don
D. didn
解析：句意：请不要忘记你的作业。你应当明天早上上交。祈使句的否定用don’t。根据题意，故选C。
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