问题
单项选择题
Suppose you tried to lift a 100-pound rock two feet, you______more work than if you______ it one feet.
A．would do...lifted
B．did...lifted
C．will do...will lift
D．would do...will lift
答案
参考答案：A
解析：这是一个虚拟条件句，由suppose引起。考生如果注意到tried是过去时形式，就不难选A项了，因为与现在事实相反的表达是，从句...did...主句：...would do...。句意是：“如果你要把重100磅的石头抬高两英尺，那么你做的功要比抬高一英尺做的功多。”