The maths problem was too difficult for students of our grad

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The maths problem was too difficult for students of our grade ___
A.to answer B.to answer it C.to work out D.to work it out
Many people think___necessary to have a good knowledge of an second when looking for a good job.
A.that B.it C.which D.if

C..
It's +adj.for sb.to do sth.
work out the maths problem
B..
sb.think it +adj.to do sth.

The maths problem was too difficult for students of our grad This maths problem is too difficult.___ of the students can The maths problem was too difficult.____worked it out. the maths problem is too difficult for me to work out还是to wo The maths problem is too difficult for him to work out 复合句 The maths problem is too difficult for him to work out.(改为复合 1、The maths problem is too difficult for us to ( ).A、work it The maths problem is too difficult.math为什么加s 一定要说明理由 The maths problem is too hard for any of us to _____ The problem was too difficult for me to work out.改为复合句选择填空：This maths problem is too difficult for us _____. The math problem was very difficult that few students could