—There is a lot of smoke coming out of the teaching-building there.?
—Really?It _________ be a fire,most probably.?
A．canB．ought toC．have toD．must
B?
考查情態(tài)動詞。由most probably可知說話人的語氣并不非�？隙�，所以用ought to表示推測，語氣比must弱一些，給自己留有一些余地。
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