单项选择题

Not until I began to work ______ how much time I had wasted.

A．didn't I realize
B．did I realize
C．I didn't realize
D．I realize
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单项选择题
We are going to learn ______ next week.
A．Lesson Twelve
B．Lesson Twelfth
C．Twelfth Lesson
D．the lesson Twelfth
单项选择题
I don't know which book is better. I shall read ______.
A．all
B．both
C．each
D．either
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