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-How do you like the cake?-It's quite different frome__I had last month.
A.that
B.which
C.the one
D.the one what
我知道选C,A为什么错
这道题百度上的讲解我都看过了：毫无疑问C是对的
但如果选A It's quite different from that I had last month.这里that是代词,先行词做从句宾语所以可省,为什么就错了呢（我知道不选which是因为缺宾语）
一推人在百度说了当白说,就没有知道的?