2. 外语
  3. By the year 200, scientists probably ______ an effective treatment for cancer.

By the year 200, scientists probably ______ an effective treatment for cancer.

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问题 By the year 200, scientists probably ______ an effective treatment for cancer.
选项 A、will have discovered
B、are discovering
C、will be discovering
D、have discovered
答案A
解析 “by+将来时间”用做时间状语时，句子的谓语部分一般使用将来完成时。而当“by+过去时间”用做时间状语时，句子的主语一般使用过去完成时。
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