选择题：Building that railway was very difficult and invol

题目内容：

Building that railway was very difficult and involved _____ ten tunnels.
得分：5分
A.dig
B.throwing
C.to have thrown
D.having thrown

参考答案：

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成本还原分配率的计算公式是( )。(本题5.0分)A、本月所产半成品成本合计/本月产品成本所耗该种半成品费用B、本月产品成本合计/本月产成品所耗半成品费用C

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Air cannot be an element _____ an element cannot be separated.（单选）—5分A in thatB