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- Lucy looks blue today.- Yes, but I don't know what it is makes herso upset. [

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- Lucy looks blue today.- Yes, but I don't know what it is makes herso upset. [

— Lucy looks blue today.
— Yes, but I don't know what it is________makes herso upset. [     ]A. as
B. what
C. that
D. which

试题答案

C

标签：donbutwhatknowyes

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