问一个句子的3个同义句.this problem is easier than that one.

问一个句子的3个同义句.this problem is easier than that one.
1.this problem is _____ ______than that one
2.that problem is _____ ______than this one
3.that problem is _____ ______ ______this one

1.less difficult
2.more difficult
3.harder compared with

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