-what am l supposed to buy for my mother as a birthday gift?-you --- get her a scarf.a\ should be supposed tob\ are supposing toc\ are supposed tod\ should suppose to为什么答案是c说明理由

-what am l supposed to buy for my mother as a birthday gift?-you --- get her a scarf.a\ should be supposed tob\ are supposing toc\ are supposed tod\ should suppose to为什么答案是c说明理由
-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

-what am l supposed to buy for my mother as a birthday gift?-you --- get her a scarf.a\ should be supposed tob\ are supposing toc\ are supposed tod\ should suppose to为什么答案是c说明理由
填 c.are supposed to
you are supposed to 和问句 what am I supposed to ...对应

be supposing to do something 是固定用法，应该做某事，跟should差不多
用多了你就会习惯，而且这个比should好用， 因为be动词可以改变时态

that's easy you can buy colthes, shoes,hats or cosmetics