未知题型
(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioaetive carbon (present) in the object (is examined).
A.The age of
B.be estimated
C.present
D.is examined
- A.A.The
B.be
C.present
D.is
【参考答案】
D
解析：改为examined。过去分词短语在句中做定语，表完成和被动；the object examined被......
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C．“猫”系统 360软件助手
D．乒乓球赛事助手软件 “猫”系统
