he found it hard _(catch up with) his classmates.怎么填 为什么?

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he found it hard _(catch up with) his classmates.怎么填 为什么?
he found it hard _(catch up with) his classmates.怎么填 为什么?

he found it hard _(catch up with) his classmates.怎么填 为什么?
to catch up with .
find it .to do sth

to catch up with

to catch up with 因为find it adj. to do sth.词组

to 这个貌似是形式主语吧,it +形容词/副词+to do sth

to catch up with