---Come and join us.
--- I’m sorry, but I’m busy. If I ________ time, I would go.


  1. A.
    have
  2. B.
    had
  3. C.
    will have
  4. D.
    have had
B
試題分析：句意:來加入我們吧!——抱歉，但是我正忙著呢。如果我有時間，我會去的。結(jié)合語境可知下文從句中是對現(xiàn)在情況的虛擬，故用一般過去時態(tài)，選B。
考點：虛擬語氣
點評：虛擬語氣是一種特殊的動詞形式，用來表示說話人所說的話并不是事實，而是一種假設(shè)、愿望、懷疑或推測。判斷是真實條件句還是非真實條件句。只有在非真實條件句中才使用虛擬語氣。通過句子意思，看假設(shè)的條件是否能夠?qū)崿F(xiàn)，能夠?qū)崿F(xiàn)是真實條件句，不能使用虛擬語氣；假設(shè)的條件不能實現(xiàn)則是非真實條件句，要用虛擬語氣.判斷這個假設(shè)是與哪個事實相反。
1、與現(xiàn)在事實相反
若與現(xiàn)在事實相反，條件從句的謂語用過去式(be通常用were)，主句謂語用“should (would, could, might)+動詞原形”
2、與過去事實相反
若與過去事實相反，條件從句的謂語用過去完成時(had+過去分詞)，主句謂語用“should (would, could, might)+have+過去分詞”
3、與將來事實相反
若與將來事實相反，條件從句的謂語用過去式(be通常用were)，主句謂語用“should (would, could, might)+動詞原形”：
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