中文谷PresidentXiJinpingdemandedthattheenvironmentalproblems
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问题详情：
President Xi Jinping demanded that the environmental problems ______ paid special attention to.
A. referred to being B. referred to be
C. refer to being D. refer to be
【回答】
B
知识点：非谓语动词
题型：选择题
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