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1. So far, nobody has known
(precise) where the virus came from.
【考点】
副词的用法;
【答案】
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语法填空（单句）
普通
课时演练
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1. This began to change in the 13th century
Giotto di Bondone.
语法填空（单句）
普通
2. In recent years, they have sought
(guarantee) the food supply by buying farmland abroad.
语法填空（单句）
普通
3. You should focus
getting the main idea of the text while reading.
语法填空（单句）
普通