题目
The two boys lost their bags. That's __________ they look sad.
A.
what
B.
why
C.
when
D.
how
知识点：表语从句章节：句法 / 复合句
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The two boys lost their bags. That's __________ they look sad.
what
why
when
how
答案与解析
自由组卷
围绕这道题再组一份练习 →
完整试卷
浏览同年级试卷结构 →