--Are you often          on vacation?   -- Not always.
A．relaxB．relaxingC．relaxedD．to relax
C

試題分析：句意：你經(jīng)常度假來放松自己嗎？——不總是這樣。結(jié)合語境可知本句主語是動詞relax的動作對象，故用被動語態(tài)，選C。
點評：此類題型主要是確定句子主語與謂語動詞的關(guān)系。如果是主動關(guān)系則用主動語態(tài)，反之如果是動賓關(guān)系，則用被動語態(tài)。注意一些接不帶to的不定式做賓語補足語的動詞用作被動語態(tài)時，不定式符號to要加上。
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