单选题
The president ______ announced the cancellation of the advertising campaign that had been scheduled to be launched in Seattle in May.
A、
regretful
B、
regretfully
C、
regretting
D、
regretted
【正确答案】
B
【答案解析】
[解析] 单词形态：副词
1．这是一道单词形态选择题，选项均为regret的不同形式。
2．主语和动词announce之间可填入副词，因此副词B．regretfully为正确选项。
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