(2013·浙江高考)Eye doctors recommend that a child's first eye exam ________ at the age of six months old.
A．wasB．be
C．wereD．is
B
選B　考查虛擬語氣。此處考查的是recommend后面賓語從句中的虛擬語氣，根據(jù)語法規(guī)則可知，從句中謂語動詞應(yīng)用“should＋動詞原形”，其中should可以省略，故選B項。
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