单项选择题

They ______ shopping, when someone knocked at the door.

A．are about to
B．are to go
C．were about to go
D．were to go
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单项选择题
The red color can stimulate all our ______, including appetite.
A．thoughts
B．worries
C．senses
D．desires
单项选择题
Adults sometimes envy children who play all the time ______ they themselves have to work, rain or shine.
A．while
B．once
C．since
D．though
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