问题
选择题
— Lucy looks blue today.
— Yes, but I don't know what it is________makes her so upset. [ ]
A. as
B. what
C. that
D. which
答案
答案：C
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— Lucy looks blue today.
— Yes, but I don't know what it is________makes her so upset. [ ]
A. as
B. what
C. that
D. which
答案：C