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【doyouknowwhereyourmatherisidoyouknowwhereyourmatherisithinkhe------ontheplayground.helikesdoingexercise?a---mustrunb---mustberuningc---couldrund---couldberunning】
题目内容：
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优质解答
b.由于是现在进行时而且表示主观,所以是must be - 追答：
- 谢好评，祝学业有成
do you know where your mather is i think he ------on the playground .he likes doingexercise?a---mustrun b---mustberuning c---couldrun d---couldberunning
优质解答
- 追答：
- 谢好评，祝学业有成
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