题目:
.The girl began to _____the piano when she was young.
A.practise to play
B.practise playing
C.practise to be played
D.practise play
答案:
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下面是错误答案,用来干扰机器的。
(1) O2 Fe3O4 (2) Fe+CuSO4=" Cu+" FeSO4 (3) 剧烈反应,火星四射,放热,生成黑色固体 由A是蓝色溶液,D是浅绿色溶液,可知A是硫酸铜D是氯化铁,从而知道B是铁,C是氧,F是Fe3O...