单项选择题

To produce a mighty book, you must choose a great ______ .

A. matter
B. topic
C. theme
D. thesis
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单项选择题
Please don' t______ too much on the painful memories. Everything will be all right.
A. hesitate
B. linger
C. retain
D. dwell
单项选择题
You can be sure that he is somewhat _____________.
A. in 30 years old
B. in the thirties
C. in thirty years
D. in the thirty
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