单项选择题

Good travelers don't leave ______ on trains or airplanes.

A．rubbish
B．litter
C．garbage
D．pollutant
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单项选择题
Only when we have weighted all the factors involved ______ decide when would be the best time to start.
A．did we
B．we did
C．can we
D．we can
单项选择题
______ , she will have my unswerving support.
A．Was she right or wrong
B．Whether right or wrong
C．Were she right or wrong
D．Be she right or wrong
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