14．Hit the shark on the nose with your fist to avoid being bitten．

分析 用拳頭打鯊魚的鼻子以免被咬．

解答 bitten 考查被動語態(tài)．a(chǎn)void doing是英語的固定結(jié)構(gòu)"避免做…"，根據(jù)句意：用拳頭打鯊魚的鼻子以免被咬，avoid后面要跟被動語態(tài)的非謂語結(jié)構(gòu)，所以答案填bitten．

點(diǎn)評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構(gòu)成．被動語態(tài)的時態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．掌握各種時態(tài)的被動語態(tài)是解題的關(guān)鍵．

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