Every night we hear strange noises outside.I think it___be teenagers having fun ,but i am not sureA.should B.could

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Every night we hear strange noises outside.I think it___be teenagers having fun ,but i am not sureA.should B.could
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Every night we hear strange noises outside.I think it___be teenagers having fun ,but i am not sureA.should B.could
Every night we hear strange noises outside.I think it___be teenagers having fun ,but i am not sure
A.should B.could

Every night we hear strange noises outside.I think it___be teenagers having fun ,but i am not sureA.should B.could
B.could
因为后面有but i am not sure
就说明不确定,所以选could,表示不确定的猜测.