题目内容

By the end of next semester, we ______ more than three thousand new words.

A. have learned
B. will learn
C. will have learned
D. have been learning

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______

A. 128
B. 160
C. 180
D. 220

Lucy ______ her homework this morning, but she didn't.

A. may be doing
B. must have done
C. should have done
D. can do

_____

A. 在键盘上单击BackSpace键
B. 右击打开快捷菜单，再选择“删除”命令
C. 在“编辑”菜单中选用“剪切”命令
D. 将该文件属性改为“隐藏”

_____

A. 交
B. 连接
C. 笛卡儿积
D. 自然连接