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'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](/uploads/image/z/8617655-47-5.jpg?t=Where%27s+Jeff%3FI%27m+not+sure.--Where%27s+Jeff%3F--I%27m+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 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