They have a difficult time (to work /working) it on .到底用哪个?

They have a difficult time (to work /working) it on .到底用哪个?
请说明理由!

低语轻言 1年前已收到2个回答举报

共回答了22个问题采纳率：90.9% 举报

用working
1.have time to do sth.指有时间去做某件事,这件事不是手头上正在做的事情,用to do; 而have time doing sth.是指有时间做现在手头上正在做的事.
2.work on：是继续做的意思.
可以看出,这是一件正在做的事情,因此用working,而不是to work

1年前

瘦呱呱幼苗

共回答了52个问题举报

to work
因为have是动词，work也是动词，两个动词之间要用to链接
因为have a difficult time的主语是they
work it on的主语也是they
前后动词形态保持一致所以用to work

1年前

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