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One of the most important questions they had to consider was ____ of public health.
A.that
B.which
人气:268 ℃ 时间:2020-06-27 03:16:22
解答
选A
考查代词的用法.选项中,只有that可以代替句单数可数名词或不可数名词,以避免重复.
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