2. 考研
  3. They provide a means of keeping ______ of the thousands of journal papers that are published monthly or quarterly.

They provide a means of keeping ______ of the thousands of journal papers that are published monthly or quarterly.

admin2005-07-06  136
问题 They provide a means of keeping ______ of the thousands of journal papers that are published monthly or quarterly.
选项 A、track
B、contact
C、relation
D、steps
答案A
解析 keep track of是一个词组，意为“跟上……，与……保持联系”。
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