We have to some bigger panies for technical help.
A. turn up
B. turn to
C. turn over
D. turn down
网友回答
A. turn up
(答案→)B. turn to
C. turn over
D. turn down
解析：考查词组辨析：A．turn up出现，露面。B．turn to求助于，C．turn over翻过来， D．turn down调低，拒绝，句意是：我们不得不向大公司寻求技术支持。选B。