D
it是形式宾语,指代work out the maths exam
后者要跟to do sth
Is ____ easy _____ out the maths problem?
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
英语人气：505 ℃时间：2020-04-07 17:26:06
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