The production of tin ore in the United States is relatively insignificant, ____

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问题 The production of tin ore in the United States is relatively insignificant, _______ less than one hundred tons annually.

选项 A、amounting to
B、in the amount
C、amounts to it
D、to the amount of

答案 A

解析现在分词短语做主语补足语。

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Historiansmaywelllookbackonthe1980sintheUnitedStatesasatimeo