题目内容
Tom's father is seriously ill, ________ is exactly ________he is worried about.
[ ]
A.which; that
B.that; what
C.what; which
D.which; what
答案:D
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题目内容
Tom's father is seriously ill, ________ is exactly ________he is worried about.
A.which; that
B.that; what
C.what; which
D.which; what