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以下哪个短语/句型不能表示提议、建议做某事?（）
A、be supposed to do
B、I appreciate ...
C、ought to
D、Why not do sth. ?
【正确答案】：B
【题目解析】：考察短语句型: be supposed to do 应该做某事 ; ought to 应该做; Why not do sth. ?为什么不...呢? I appreciate ...我感激/欣赏...