问题
选择题
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
答案
答案：A
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。