--- This must be a footprint of a tiger.
--- It ____ be. A tiger’s should be much larger and deeper than this.
A．mustn’t B．won’t C．shan’t D．can’t
D

試題分析：考查情態(tài)動(dòng)詞。A不可以；B將不；C將不，常用于第一人稱；D不可能。句意：——這一定是老虎的腳印。——不可能，老虎的腳印應(yīng)當(dāng)比這腳印要大得多、深得多。故D正確。
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