12(5.0分) Mary is always ready to help others when they are in trouble and she never ____ their requests. A) turns up B) turns over C) turns in D) turns down

12(5.0分)

Mary is always ready to help others when they are in trouble and she never ____ their requests.
A)
turns up
B)
turns over
C)
turns in
D)
turns down

出自：华北水利-土木工程-大学英语（3）

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