It would be very safe if you_________ the door_________ to the garden.
A．fasten;ledB．will fasten;leadsC．fastened;leadingD．fastened;to lead
C
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。?
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