单项选择题

Computers can only recognize（）signals.

A.analog
B.infrared ray
C.light
D.digital

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单项选择题

I am very grateful to you for （）you have done for me.

A.which
B.that
C.all what
D.all that

单项选择题

—You can’t finish the work in less than an hour，I suppose？—（）.

A.No，hardly
B.Sorry，I can’t
C.Yes，I’m sure I can
D.I don’t think I can