It is only gradually, with the passing of years, to a clear understanding of their position.
A. that they e
B. do they e
C. that e
D. when they e
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(答案→)A. that they e
B. do they e
C. that e
D. when they e
解析：考查强调句型。本题强调的是时间状语only gradually, with the passing of years，句意：只有逐渐地，随着时间的流逝他们才会逐渐认识到他们的地位。在强调句型中要使用陈述语气。如果本句不使用强调句型，而是把only放在了句首，强调后面的时间状语，那么主句中要使用部分倒装的形式。本题A正确。