So difficult did he find _______ to pass the driving test that he decided to give up.A.howB.thatC.whichD.it
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D解析试题分析：考查it的用法：这句话是倒装句，改成正常语序是He found it so difficult to pass the driving test that he decided to give up.句型是find it+adj+to do作形式宾主语替代不定式，句意：他发现通过驾驶测试是如此难，以至于他决定放弃。选D。考点：考查it做形式宾语的用法
点评：it做形式宾语还适用于动词find ，feel，make，consider+it+to do/that 从句。