Once e-mail learners with the basic knowledge of how to use the network, they to a local network and a global network.
A. are equipped … will be linked
B. are equipping…will be linked
C. are equipped … will link
D. will be equipped…will be linked
网友回答
(答案→)A. are equipped … will be linked
B. are equipping…will be linked
C. are equipped … will link
D. will be equipped…will be linked
解析：考查时态。根据once一旦及句意可知，从句用一般现在时代替将来时，主句用将来时态，主语they与link为被动关系，故选A。