单项选择题

——What's your problem
——I have lost sight of my morn and dad, but just I saw them ______ in front of me.

A．were walking
B．to have walker
C．walk
D．walking
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单项选择题
______ you get up late won't be a sufficient excuse for your being late for class.
A．When
B．That
C．Because
D．What
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