问题描述：
-what am l supposed to buy for my mother as a birthday gift?-you --- get her a scarf.
a\ should be supposed to
b\ are supposing to
c\ are supposed to
d\ should suppose to
为什么答案是c
说明理由
a\ should be supposed to
b\ are supposing to
c\ are supposed to
d\ should suppose to
为什么答案是c
说明理由
问题解答：
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