题干
He said _____ he would come back in a week.
A：when
B：what
C：that
D：why
答案(点此获取答案解析）
C
He said _____ he would come back in a week.
A：when
B：what
C：that
D：why
ClO＞HCO3－，氧化性：HClO＞Cl2＞Br2＞Fe3+＞I2。