Question

They were determined to carry out the plan at first, but then we ________ persuade them to change their minds.

A．would

B．could

C．were able to

D．had to

Answer 1

C

考查be able to用法。Be able to do sth表示经过努力做成某事。句意：起初他们决定执行那个计划，但是后来，我们说服了他们改变了主意。