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题目内容
（华北水利水电大学混凝土结构设计原理）
______ as much as one-fourth of all material harvested is not used. ( )(本题2.0分)
A、 The estimate
B、 The estimate that
C、 They are estimated
D、 It is estimated
A、 The estimate
B、 The estimate that
C、 They are estimated
D、 It is estimated
参考答案