专四
A．Why not to call on
B．Why don't call on
C．Why not calling on
D．Why not call on
【解析】固定句型。Why not do sth．?表示“为什么不……?”通常用作建议，如：Why not come more often?若 用助动词do，则需主语you，B若改为：why don’t you call on，也正确。
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