单选题
All of the international delegates attending the conference ______ to bring a souvenir from their own countries.
A、
has asked
B、
is asking
C、
were asked
D、
was asking
【正确答案】
C
【答案解析】
[解析] 主语“delegates”是复数，谓语动词应为复数形式。答案是C。
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