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

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

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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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