[文法] 幾題文法想請問大家

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______ is very good exercise for the mothers-to-be.
(A) Swimming　(B) To swim　(C) Go swimming　(D) Swim
答案是A,想知道B為什麼不行,不是toV也可以當主詞

A strong man with a gun was seen ______ Mr. Wang’s house.　That man must
have been a
robber.
(A) to enter　(B) enter　(C) entering　(D) to entering
答案是A想知道C可以選嗎
因為手邊上面資料寫S+be+seen/heard+to V /Ving,那其他的感官動詞是否也有這個用法

Tolkien’s famous series of novels, The Lord of the Rings, ______ by people
all over the
world.
(A) read　(B) reading　(C) is being read　(D) has been read
答案是D
想知道A為什不能選,空格變成 which are  read簡化後剩read這樣可以嗎?
還有確認關代和beV省略的確切用法


謝謝


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