单项选择题

It ( ) around six o'clock when I drove back yesterday because it was already dark.

A．must have been
B．must be
C．was to be
D．had to be
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单项选择题
He knows little of packing, and ( ) of payment.
A．still less
B．no less
C．still more
D．even more
单项选择题
The importance of delivery on time ( ) overstressed, because failure to receive goods or services will cause serious inconvenience to the end-users.
A．can
B．be
C．cannot be
D．could be
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