I’m not good at Maths, so I don’t know _________ out this difficult Maths problem.
A.when to work | B.who to work |
C.what to work | D.how to work |
I’m not good at Maths, so I don’t know _________ out this difficult Maths problem.
A.when to work | B.who to work |
C.what to work | D.how to work |