do you know where your mather is ido you know where your mather is i think he ------on the playground .he likes doingexercise?a---mustrun b---mustberuning c---couldrun d---couldberunning

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doyouknowwhereyourmatherisidoyouknowwhereyourmatherisithinkhe------ontheplayground.helikesdoingexerc

do you know where your mather is ido you know where your mather is i think he ------on the playground .he likes doingexercise?a---mustrun b---mustberuning c---couldrun d---couldberunning
do you know where your mather is i
do you know where your mather is i think he ------on the playground .he likes doingexercise?a---mustrun b---mustberuning c---couldrun d---couldberunning

do you know where your mather is ido you know where your mather is i think he ------on the playground .he likes doingexercise?a---mustrun b---mustberuning c---couldrun d---couldberunning
b.由于是现在进行时而且表示主观,所以是must be