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In a sense, farmers began primitive genetic engineering (at the dawn of) agriculture, (which) they kept seeds (from) their best
In a sense, farmers began primitive genetic engineering (at the dawn of) agriculture, (which) they kept seeds (from) their best
admin
2005-07-06
116
问题
In a sense, farmers began primitive genetic engineering (at the dawn of) agriculture, (which) they kept seeds (from) their best plants, gradually (improving) the quality of successive generations.
选项
A、at the dawn of
B、which
C、from
D、improving
答案
B
解析
which应改为when,因为修饰的是时间,即农业的初期。
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