题目内容


---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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