If we ________ one of the other uploading approaches, the process would have taken longer than one hour.
A．used　B．had used
C．should useD．would use
B
句意：如果我們使用其他上傳方法，那么這個過程要超過一個小時。分析句子結(jié)構(gòu)和時態(tài)可知，題干是表示與過去事實相反的虛擬語氣，故從句謂語動詞用had done形式。
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