问题描述：
Is ____ easy _____ out the maths problem?
Yes.You can work it out in three minutes.
A.this；to work b.this；working C.it;working D.it；to work
说明原因
Yes.You can work it out in three minutes.
A.this；to work b.this；working C.it;working D.it；to work
说明原因
问题解答：
我来补答展开全文阅读