You’d better wear a pair of comfortable trainers when ________a long walk.
A．you takeB．takingC．to takeD．A&B
D
考查when的用法。句意“去遠(yuǎn)足時(shí)，你最好穿一雙舒服的運(yùn)動(dòng)鞋。”when后跟從句時(shí)，主語(yǔ)謂語(yǔ)缺一不可，即選A；當(dāng)主句和從句主語(yǔ)一致時(shí)，從句可省略主語(yǔ)謂語(yǔ)，主動(dòng)用現(xiàn)在分詞，被動(dòng)用過(guò)去分詞，故B也正確。故選D。
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