题目内容
（请给出正确答案）
[主观题]
Only when he has lost his way ______ that he wasn' t careful enough to make sure that he r
eally did understand.
A．he realize
B．he can realize
C．he has realized
D．does he realize
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A．微生物
B．寄生虫虫卵
C．螨类
D．谷蛾
