onlythen____thathehadlostachanceofachievinghisdream.aherealizedbdidherealizedcdidherealize为什么不选b
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题目内容：
only then ____that he had lost a chance of achieving his dream.
a he realized
b did he realized
c did he realize
为什么不选b
优质解答
因为前面已经有了 "did", 所以 "realize" 不需要是过去式.
本题链接：
