摘要：( ) - We'll go to Qing Yuan Mountain tomorrow. Why join us? -That's a good idea. don't didn't
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—We'll go to Qing Yuan Mountain tomorrow. Why _ _ join us?
—That's a good idea.
—That's a good idea.
[ ]
A. not
B. don't
C. can't
D. didn't
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B. don't
C. can't
D. didn't