结尾要双写r加ed的单词总结
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结尾要双写r加ed的单词总结结尾要双写r加ed的单词总结结尾要双写r加ed的单词总结prefer→preferred occur→occurred star-starred bar
结尾要双写r加ed的单词总结
结尾要双写r加ed的单词总结
结尾要双写r加ed的单词总结
prefer→preferred
occur→occurred
star-starred
bar-barred
refer -referred
stir-stirred