题干
—What will you do next Sunday?
—Maybe do some shopping, for I ______go to school on Sunday．
—Maybe do some shopping, for I ______go to school on Sunday．
A：mustn’t
B：shouldn’t
C：don’t have to
D：had better not
答案(点此获取答案解析）
C
2PbSO4+2H2O）电解苦卤水 (含C1―、Br―、Na＋、Mg2＋)的装置如图所示 (a、b为石墨电极)。
