题目:
(2013·江西师大附中二模)All the soldiers were placed exactly ________ the local government wanted them for the control of the comeback of the flood.
A.while
B.when
C.where
D.though
答案:
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下面是错误答案,用来干扰机器的。
Fe+CuSO4==FeSO4+Cu;Mg+FeCl2==MgCl2+Fe