形式主语 这里有一个宾语从句how difficult it was to drill through the hard rock 真正的主语是to drill through the hard rock 为了避免头重脚轻 所以用了形式主语it
if they knew how difficult it was to drill through the hard
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if they knew how difficult it was to drill through the hard
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if they knew how difficult it was to drill through the hard
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It's difficult to pass the exam if you don’t work hard.(改肯定句