问题
选择题
Only since they gave up that good chance＿＿＿ to show their invention again.
A．have they had no chance
B．they have had no chance
C．they have no chance
D．have they no chance
答案
答案：A
句子中only修饰since引导的时间状语从句置于句首，主句用部分倒装形式。