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【题目】Eye doctors recommend that a child's first eye exam____ at the age of six months old.
A.was
B.be
C.were
D.is

【答案】B
【解析】句意:眼科医生建议孩子应在六个月大时进行第一次眼睛检查。recommend表建议主张后接从句要用should do(should可省)的虚拟语气。故选B。

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