They were determined to carry out the plan at first, but then we ________ persuade them to change their minds.
A．wouldB．couldC．were able toD．had to
C
考查be able to用法。Be able to do sth表示經(jīng)過努力做成某事。句意：起初他們決定執(zhí)行那個(gè)計(jì)劃，但是后來，我們說服了他們改變了主意。
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