2. 外语
  3. While the total number of farmers engaged in the agriculture production is barely half ______it used to be in 1959, the size of

While the total number of farmers engaged in the agriculture production is barely half ______it used to be in 1959, the size of

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问题 While the total number of farmers engaged in the agriculture production is barely half ______it used to be in 1959, the size of the average farm has tripled.
选项 A、that
B、what
C、which
D、how
答案B
解析 half what it used to be 相当于 half the number that it used to be，what既代替先行词the number 又引导一个从句，其他几个选择项均没有这个功能。
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