9. At first I regretted     them to stay, but we soon became great friends. 

A. to invite          B. invited

C. to have invited      D. inviting

9.    D考查非謂語動詞。句意：起初，我后悔邀請他們留下來， 但是我們很快成了好朋友。regret doing sth后悔做了某事； regret to do sth遺憾（將要）做某事。根據(jù)句意可知，invite這個動作已經(jīng)發(fā)生，故regret后應(yīng)該用動名詞，故選D。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練28動詞變化類綜合訓(xùn)練

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