[考題] 三個文法選擇題目 請幫忙解惑 謝謝>"<
考題：一般
題目：
一、All you have to do today is _____ at home doing exercise.
(A) stay (B) staying (C) stayed (D) have stayed
答案寫(A)，想請問為什麼？如果要翻書的話，請問這是屬於哪章節的呢？
二、The heavy rain kept us _____ on a picnic on Sunday.
(A) from to go (B) with going (C) from going (D) to putting up
答案寫(C)，想請問為什麼？這題目的中文意思其實我也看不太懂..
kept在這邊是阻礙的意思嗎？
三、He will not come unless _____ .
(A) inviting (B) invited (C) having invited (D) to have invited
答案是(B)，想請問為什麼？這題目是屬於假設語氣那個章節的嗎？
我找不到有關unless的用法>"<
再麻煩會的人幫忙解惑了，感激！
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