40. It would be very safe if you_________ the door_________ to the garden.

A.fasten;led                           B.will fasten;leads

C.fastened;leading                      D.fastened;to lead

C


解析:

此處為虛擬語氣，條件句中用一般過去式，主句中用would+v.(原形)表示對現(xiàn)在的虛擬；第二空用分詞作后置定語。?

答案：C?

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