I don’t know why they are standing there.（改同义句）I don’t know _________ they are standing there _____.

I don’t know why they are standing there.（改同义句）I don’t know _________ they are standing there _____.
I don’t know why they are standing there.（改同义句）
I don’t know _________ they are standing there _____.

I don’t know why they are standing there.（改同义句）I don’t know _________ they are standing there _____.
答案：I don’t know 【what】they are standing there【for】 .
翻译；我不知道他们此刻为什么站在那里?
解析；what...for=why【为什么】
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