Sorry, I am too busy now. If I _____ time, I would certainly go for an outing with you.
A．haveB．have hadC．had hadD．had
D

試題分析：句意：對不起，我現(xiàn)在太忙了，如果我有時間，我肯定和你去郊游。本句中if引導的從句表示對現(xiàn)在的情況進行假設，從句用did，主句用would +do,故選D
點評：if的虛擬語氣非常重要，簡要概括如下：1、表示與現(xiàn) 在事實相反的情況，從句：If主語+過去時(Be動詞用were)；主句：主語+should/would/could/might+do：　2、表示與過去事實相反的情況，從句：If主語+had+done；主句：主語+should/would/could/might+have done　3、表示對將來情況的主觀推測，從句：①if+主語+were to do②if+主語+should+do ③if+主語+did（動詞過去式）/were ；主句：主語+should/would/could/might+do　
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