6．Having a walk after supper is certainly good for the old people，but it remainsto be seen （see）whether they will enjoy it．

分析 晚飯后散步當(dāng)然對老年人有好處，但是這也有待于看他們是否享受散步．

解答 答案是to be seen．考查詞組remain to do sth．有待于做某事．句意是"晚飯后散步當(dāng)然對老年人有好處，但是這也有待于看他們是否享受散步．"but引導(dǎo)的從句中it是形式主語，真正的主語是whether引導(dǎo)的主語從句，主語從句和動詞see之間是被動關(guān)系，所以用被動語態(tài)．所以答案是to be seen．

點評 本題考查用所給單詞的適當(dāng)形式填空．首先要根據(jù)語境明確句意，然后再根據(jù)相關(guān)語法對所給單詞在形式上做出正確的變動．

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