摘要：36．A．must B．should C．shall D．can
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On rainy days, accidents ______ happen sometimes on steep roads．
A．should B．shall C．must D．can
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On rainy days, accidents ______ happen sometimes on steep roads．
A．should B．shall C．must D．can
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Jack ________ be really difficult occasionally even if he’s a nice guy in general．
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A．must
B．should
C．shall
D．can