— You seem to be familiar with this city! — I ______ English in a school here for two years.It's
A.
33.— You seem to be familiar with this city! — I ______ English in a school here for two years.It's great to be back again! A.taught
B.
have been teaching
C.
had taught
D.
have taught
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【简答题】4 “ My son has a kid now, so I don’t have to worry about anything, ” he said with ________ . (academic average dessert exchange experience fond satisfaction sculpture Spanish surf )
【单选题】过氧化氢水溶液俗称双氧水,过氧化氢易分解为水和氧气,常作氧化剂、漂白剂和消毒剂,为贮存、运输、使用的方便,工业常将H 2 O 2 转化为过碳酸钠晶体(其化学式为2Na 2 CO 3 .3H 2 O 2 ),它具有Na 2 CO 3 和H 2 O 2 的双重性质。下列物质不会使过碳酸钠晶体失效的是