Mary found _______,A.Chinese difficult to learn B.Chinese difficult to be learnedMary found _______A.Chinese difficult to learnB.Chinese difficult to be learned选A的话，Chinese 和difficult 之间不用加is

Mary found _______,A.Chinese difficult to learn B.Chinese difficult to be learnedMary found _______A.Chinese difficult to learnB.Chinese difficult to be learned选A的话，Chinese 和difficult 之间不用加is
Mary found _______,A.Chinese difficult to learn B.Chinese difficult to be learned
Mary found _______
A.Chinese difficult to learn
B.Chinese difficult to be learned
选A的话，Chinese 和difficult 之间不用加is

Mary found _______,A.Chinese difficult to learn B.Chinese difficult to be learnedMary found _______A.Chinese difficult to learnB.Chinese difficult to be learned选A的话，Chinese 和difficult 之间不用加is
A
Mary found Chinese difficult to learn
这里的意思是玛丽发现中文（对她而言）很难学
Mary found Chinese difficult for he to learn
需要用主动
不需要加is
1.Wethinkitnecessarytodosth.我们认为做某事是必要的.
来自互联网
2.Don'tlingeraway your holidays.Trytofindsomethingusefultodo.不要虚度假日,尽量找些有意义的事做.
来自《简明英汉词典》
3.I find it hardtoget my tongue round thesePolishnames.我发现很难把这些波兰名字音发准确.
来自《简明英汉词典》
4.Manypeoplefinditdifficulttofill in a form.许多人发现表格填写困难.
来自《简明英汉词典》