问题
选择题
______, they would certainly come and help us.
A．Had they time
B．Do they have time
C．Had they have time
D．Did they had time
答案
答案：A
这是一个if引导的条件从句的省略，如果包含had, were, should, 或could, if的虚拟条件句省略时，就要将这些词放在主语前面作部分倒装。