Most boys, and many girls too, have at some time or other started a stamp collection. Stamp-collecting, or, to call it【21】its co

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问题     Most boys, and many girls too, have at some time or other started a stamp collection. Stamp-collecting, or, to call it【21】its correct name, philately,【22】an increasing popular hobby from as【23】as 1854 -- for less than two decades (十年) after postage stamps【24】. Today the hobby numbers【25】are not only boys and girls, but also men and women from all ranks (阶层) in society. So rapidly【26】the interest in stamp-collecting increase in the United States of America【27】in 1921 the United States Post Office found itself【28】set up a special department to【29】the needs of collectors. At present the yearly【30】of this department total over three hundred thousand dollars.

选项 A、is
B、has been
C、was
D、had been

答案B

解析 看后面的after...可判断此处应为现在完成时态。
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