So many people violate traffic regulations that we ____ put too much emphasis on the importance of traffic safety.

A．must not B．should not C．need not D．cannot

D

解析試題分析：考查情態(tài)動詞。A禁止；B不應(yīng)當；C不必；D不能。句意：這么多的人違反交通規(guī)則，以至于我們不得不強調(diào)交通安全的重要性。故D正確。
考點：考查情態(tài)動詞

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