By the year 2010, scientists probably ______ an effective treatment for cancer.

admin2010-01-15  38

问题 By the year 2010, 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”用作时间状语时,句子的谓语部分一般使用将来完成时。而当“by+过去时间”用作时间状语时,句子的主语一般使用过去完成时。
转载请注明原文地址:https://kaotiyun.com/show/3hnK777K
0

最新回复(0)