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單項選擇題

Shall I get some chalk for you? （）

A.That's right
B.No, thanks, let Tom do it
C.I can do it without you
D.Not at all

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Selecting a mobile phone for personal use is no easy task because technology（）so rapidly.

A.is changing
B.has been changed
C.will have changed
D.will change

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Professor White contributed a lot to our community,（）

A.teaching, writing, and lecturing
B.teaching, writing, and a lecturer
C.a teacher, a writer, and lecturing
D.teaching, lecturing, and a writer