一、_____it rain tomorrow,we would have to put off the visit to Mount Tai.
A、 were
B、 should
C、 would
二、If it were not for the fact that she_____sing,I would invite her to the party
A、Couldn't
B、shouldn't
C、can't
三、What would have happened____,as____far______as the river bank?
A、Bob had walked farther
B、if should walk farther
C、had Bob walked farther
以上三題請(qǐng)給出正確選項(xiàng),并說明原因,
（另,因我目前分?jǐn)?shù)只有8分了,汗一個(gè).我后面再追加分?jǐn)?shù)吧）