单项选择题

() that store digital certificates are particularyly handy when you shop at a site that.

A、None of the above
B、Electronic checks
C、Electronic wallets
D、Electronic Cash
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() shall we give up our plan.
A、In no case
B、On this case
C、In any case
D、On the case
单项选择题
Please () me to introduce my sister to you.
A、give
B、have
C、allow
D、ask
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