was it 8 o'clock _____you heard someone _____ at the door?a.when;knockingb.when;knockc.that;knockd.that;knocking请略解

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• Was it8o'clock( )you heard someone ( )at the door.a.when; knockingb.when; knockc.that; knockingd.that; knock
• was it 8 o'clock _____you heard someone _____ at the door?a.when;knockingb.when;knockc.that;knockd.that;knocking请略解
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• an hour before midnight is worth two