问题
Mrs. White looks old for her age.-Yes. It worries her most ________ her hair is turning gray.[ ]
A:which
B:if
C:that
D:what
B:if
C:that
D:what
正确答案是：
同类题型
Of all the sports shoes, John bought ______ pair. Then he had some money for socks.
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The government officials made a quick reaction _______ the news of the earthquake.[ ]
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