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---Listen! The fire engine is roaring! (消防车吼叫)
--- Oh, there ______ be a fire somewhere. How terrible!
A.shouldB.mustC.have toD.will
B
情态动词辨析。A. 应该 B. 必须;一定    C. 必须;不得不  D.愿意。句意:听!消防车正在鸣叫。——哦,一定是有地方发生火灾了。太可怕了。Must强调主观判断的肯定,have to强调由于客观情况的被动动作,结合语境可知选B。
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