The United States discovered in 1982 that about one-fifth of its farmland ______

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问题 The United States discovered in 1982 that about one-fifth of its farmland ______ topsoil at a rate likely to diminish the soil’s productivity.

选项 A、is losing
B、to be lose
C、was losing
D、being lost

答案 C

解析过去进行时可表示过去的某个时间动作在进行，根据句意，C正确。

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