题目内容
【题目】When I try to understand ________ that prevents children from getting fat, it seems to me that there are two reasons.
why it is
what it is
why is it
what is it
【答案】B
【解析】what引导从句作understand的宾语,而且宾语从句为强调句型,被强调的就是连词what,选项D的语序不正确(因为名词性从句中要用陈述语序)。
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