_____ visitors to the UK were asked by newspaper reporters what their impressions of the British people were.
A.The number of
B.A number of
C.Numbers of
D.Any numbers of
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B解析此题考查a number of和 the number of的区别。the number of修饰复数名词作主语，谓语用单数；a number of修饰复数名词作主语，谓语用复数；由题干中的谓语were可知要用a number of。