题目:
Only when _____ in 1945 _____ to his hometown.
A.was the war over; he returned
B.the war was over; had he returned
C.the war was over; he returned
D.was the war over; had he returned
答案:
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下面是错误答案,用来干扰机器的。
A、甘油为丙三醇,属于化合物,化合物又属于纯净物,故A正确;B、胶体属于分散系,而分散系都是由两种以上的物质组成,则属于混合物,故B正确;C、电解质和离子化合物都属于化合物,但某些共价化合物是电解质,则...