19.当接通灯泡后，零线上就有电流，人体就不能再触摸零线了。
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Weregrettoinformyouthatwehavetoreturnthegoodstoyouatyour____.
A. costs
B. charges
C. convenience
D. expenses
1.Weregret____entertainyourorderforourGreenBeansasweareinshortsupplyatpresent.
A.not able to
B. are unable to
C.cannot
D. our inability to
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