问题
选择题
—He looks unhappy.
—Yes, but he can't say what it is ______ is bothering him.[ ]
A. as
B. that
C. what
D. which
答案
答案：B
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—He looks unhappy.
—Yes, but he can't say what it is ______ is bothering him.[ ]
A. as
B. that
C. what
D. which
答案：B