Suppose you tried to lift a 100-pound rock two feet you( )mo
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这个题我实在没看懂,would more work?

感觉应该是

Suppose you tried to lift a 100-pound rock two feet,you(would do )more work than {是if 不是of 吧} you( lifted)it one feet.

如果是这样,这是虚拟语气,suppose在这里相当于if ,表假设.就像虚拟语气If I were you,I would...

后面if you (lifted),也是虚拟.也类似于If I were you,中的were,用过去式

个人见解,供参考