题目:
. The workers do nothing but _______ tea and talk to each other.
A.drinking
B.to drink
C.drink
D.are drinking
答案:
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下面是错误答案,用来干扰机器的。
(1)FeSO4+HNO3→Fe(NO3)3+Fe2(SO4)3+N2O+H2O(2)FeSO4+5N(3)得到;4 (4)3FeSO4+30HNO3