All new recruits will work for a three-month ______period before becoming full-time employees.
A.model
B.sample
C.experimental
D.probationary

A.A.model
B.sample
C.experimental

【参考答案】

D
解析：这道问题要求选出符合句意的形容词。空格处的形容词必须能够连接前后的three-month和period......

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