---Listen! The fire engine is roaring! (消防車吼叫)
--- Oh, there ______ be a fire somewhere. How terrible!
A．shouldB．mustC．have toD．will
B
情態(tài)動詞辨析。A. 應該 B. 必須；一定    C. 必須；不得不  D.愿意。句意：聽！消防車正在鳴叫�！叮欢ㄊ怯械胤桨l(fā)生火災了。太可怕了。Must強調主觀判斷的肯定，have to強調由于客觀情況的被動動作，結合語境可知選B。
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