Students  should ______ to choose their own uniforms.
A．a(chǎn)llowB．a(chǎn)llowedC．a(chǎn)re allowedD．be allowed
D

試題分析：句意：應該允許學生們自己選擇他們的制服。本句中should是情態(tài)動詞，后面動詞用原形，學生們是允許的對象，故用被動語態(tài)。選D。
點評：此類題型主要是確定句子主語與謂語動詞的關系。如果是主動關系則用主動語態(tài)，反之如果是動賓關系，則用被動語態(tài)。
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