18．Your hands ______ before meals．They are too dirty．（　　）
A．must washB．can washC．must be washedD．can be washed

分析 你的手必須在飯前洗，因為它們太臟了．

解答 答案：C．考查情態(tài)動詞及被動語態(tài)．句意"你的手必須在飯前洗，因為它們太臟了．"．主語hands"手"是動詞wash"洗"動作的承受者，因此用被動語態(tài)，因此A，B不正確．情態(tài)動詞的被動語態(tài)結(jié)構(gòu)是情態(tài)動詞+be動詞+動詞的過去分詞．must必須，語氣比較強烈．can可以．結(jié)合語境"手必須飯前洗"，應(yīng)該用must be washed，D不正確．答案是C．

點評 考查情態(tài)動詞．情態(tài)動詞在句中不受人稱，性別，單復(fù)數(shù)變化的影響，但是要考慮時態(tài)，交際用法等．情態(tài)動詞的被動語態(tài)結(jié)構(gòu)是"情態(tài)動詞+be+動詞的過去分詞"．結(jié)合語境，選擇情態(tài)動詞的適當用法．

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