You'd better not ride the bicycle on snowy days; you ______ fall．

A．must B．might
C．have to D．ought to

B

解析試題分析：句意：你最好在下雪天不要騎車，你可能會跌倒的。Might表示“可能”，must“必須”，have to“不得不”，ought to應(yīng)該，所以選B。
考點：考查情態(tài)動詞

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