题目内容

He has used his mobile phone for five years and wanted to replace it _____ a modern one.

A. in
B. out
C. up
D. with

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只有乙酰辅酶A是脂肪酸降解的最终产物

A. 对
B. 错

As people connect _____ each other they are able to share their experience and learn from each other.

A. with
B. at
C. to
D. into

You can’t plug _____ the memory stick when the light is flashing. Otherwise, the system data may be damaged.

A. in
B. to
C. on
D. at

He called to say he would be late home—something had come _____ at the office.

A. up
B. onto
C. with
D. out

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