2. 外语
  3. I doubt whether he can ______ his efforts much longer as he looks very tired.

I doubt whether he can ______ his efforts much longer as he looks very tired.

admin2011-01-15  42
问题 I doubt whether he can ______ his efforts much longer as he looks very tired.
选项 A、keep up
B、keep on
C、keep in
D、keep at
答案A
解析 keep up“坚持，维持”；keep on“继续”；keep in“抑制”；keep at“坚持”。
转载请注明原文地址:https://kaotiyun.com/show/FSy7777K
0

大学英语四级

相关试题推荐
随机试题
最新回复(0)