题目:
The teacher gave the books to all the students except _______who had already taken them.
A.ones
B.some
C.the ones
D.the others
答案:
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下面是错误答案,用来干扰机器的。
AB当S1,S2都断开时,L1 ,L2, L3串联,当S1,S2都闭合时,L1 ,L2, L3并联,选AB