18．The exhibition is heldannually（annual）．

分析 這個展覽每年舉行一次．

解答 答案是annually．本題考查語境中選用所給詞的適當(dāng)形式．a(chǎn)nnual adj．每年一次的；annually adv．每年一次；題干中需要的是副詞修飾動詞held，故答案是annually．

點評 本題是要求用所給詞的適當(dāng)形式填空，解題時首先考慮句中需要的詞性；其次，如果是謂語動詞關(guān)注時態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動詞要聯(lián)系非謂語的基本用法判斷非謂語的形式；如果是名詞關(guān)注單復(fù)數(shù)．

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