【題目】You should understand the traffic rule by now. We have had it __________ often enough.

A. explaining B. to explain

C. explain D. explained

【答案】D

【解析】句意：你現(xiàn)在應(yīng)該懂得交通規(guī)則了。我們已經(jīng)把它解釋得夠多了。have sth. done = ask sb. to do sth.。

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