Who's that boy reading in the garden?Is it David?It( )be David.I saw him in the
问题描述：
Who's that boy reading in the garden?Is it David?It( )be David.I saw him in the
Who's that boy reading in the garden?Is it David?
It( )be David.I saw him in the classroom just now
A.must B.can't C.may D.shouldn't
答
B 不可能是（ 否定句中的猜测用can't）