Where's Jeff?I'm not sure.--Where's Jeff?--I'm not sure.He ___ be playing football on the playground.A needB mightC mustD can
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Where''sJeff?I''mnotsure.--Where''sJeff?--I''mnotsure.He___beplayingfootballontheplayground.AneedBmightC
Where's Jeff?I'm not sure.--Where's Jeff?--I'm not sure.He ___ be playing football on the playground.A needB mightC mustD can
Where's Jeff?I'm not sure.
--Where's Jeff?
--I'm not sure.He ___ be playing football on the playground.
A need
B might
C must
D can
Where's Jeff?I'm not sure.--Where's Jeff?--I'm not sure.He ___ be playing football on the playground.A needB mightC mustD can
B might
根据i am not sure说明不确定
B I'm not sure表示不确定 所以用might
B, I'm not sure 表示不确定，所以不能用must,
B表猜测，不确定
C 用于过去时态比较多，must have done
或者用于must be 后面加名词或者形容词