课时跟踪检测(五) nelson mandela — a modern hero ⅰ.单项填空 1．i caught several fish after four hours, and only then ________ that the secret of success was patience. a．i realized b．i had realized c．did i realize d．had i realized 2．tom said that his uncle had bought an ipad 3 four months before, ________ personally i doubted very much. a．that b．for which
