Teachers recommend parents_____their children under 12 to ride bicycles to school for safety.
A．not allowB．do not allow
C．mustn’t allowD．couldn’t allow
A

試題分析：通過分析句子結(jié)構(gòu)，可知這個句子中包含了一個省略了that的賓語從句。這里recommend 是建議，所以賓語從句用虛擬語氣，should+動詞原形， should可以被省略。
點評：在表示建議 suggest 、advise、propose;要求demand 、desire、request；決定 decide;命令 order、command、require;堅決主張 insist;等動詞后跟賓語從句，用（should）+v．（虛擬語氣）eg． I suggested that you（should）study hard．He ordered that we should go out at once．
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