单选题
The advertisement for Super Suds detergent ______ that the sale has increased by 25 % in the first quarter of the year.
A、
have been so successful
B、
had been so successful
C、
has been so successful
D、
will be so successful
【正确答案】
C
【答案解析】
[解析] 主语advertisement是单数形式，空格处的时态应与后面一致，答案是C。
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