had become 和 had became 的区别?还是没有had became,只有had become 和 became 这两种说法呢?

had become 和 had became 的区别?还是没有had became,只有had become 和 became 这两种说法呢? in a few years the small workshop had become a large factory.had 和become 是什么词性啊.如果become是动词,had 是什么啊. what had become of 是什么意思? I love you had not become secret. had had i have had和 i had had 有什么区别? has had 和had had有什么区别? Had been telling和 Had told 求问had gone和had been had saw和had seen 的区别 she had the looks to become a model翻译 Because had because,so had so,since has become since,why say why. When Tom had had Smith had had had had had had made Smith rank 前面2个had 后面连续6个hadwhen Tom had（1） had（2） Smith had（3） “had ”（4），had（5） had（6） “had”(7) had(8) made Smith rank first？1和8表示过去完 E-books （ ）very popular since they came into being A become B have become C had become D became Hans returned to his family home,but the house had been bombed and no one in the neighbourhood knew what had become of the inhabitants.what had become of the inhabitants 这里看不懂,特别是 become of 试题：You should have put the milk in the ice-box; I expect it ____undrinkable by now.试题：You should have put the milk in the ice-box; I expect it ____undrinkable by now.A.became B.has become C.had become D.becomes为什么这里不能用 bec by the time the earthquake ended,millions of people had become homeless.为什么加had?直接became可以吗？