______ I saw the machine, I could not have imagined how efficiently it works.A、B

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问题 ______ I saw the machine, I could not have imagined how efficiently it works.

选项 A、But for
B、Because
C、But that
D、If

答案 C

解析 “but that+句子”做“假设没有……”解，引出虚拟条件句，应注意的是，用but that时，可用一般过去时代替从句中的过去完成时，以表示对过去事实相反的假设。

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Ithasbeenrathercostlytoinstallthemachinery,butitwillprovetobewort