It is strongly recommended that the machine_____________ every year.
A．a(chǎn)re checkedB．should checkC．checkedD．be checked
D

試題分析：It + be + recommended + that從句結(jié)構(gòu)中，that從句應(yīng)用“ should + 動詞原形”，其中should可省略,故選D。
點(diǎn)評：It + be + 動詞的過去分詞 + that從句ordered, suggested ,advised, requested, demanded, advised , required , insisted…)，that從句應(yīng)用“ should + 動詞原形”，其中should可省略的虛擬語氣。
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