Many people at that time believed that spices _______ food; however, Hall found that many marketed spices were teeming with bacteria, moulds and yeasts.
问题1选项
A.helped preserve
B.help preserve
C.helps preserve
D.help to preserve
【选项释义】 A. helped preserve 有助于保存 B. help preserve 有助于保存 C. helps preserve 有助于保存 D. help to preserve 有助于保存 【考查点】动词短语辨析。 【解题思路】根据主句谓语动词“believed”可知该宾语从句的谓语动词应该用一般过去式，所以选项中的谓语动词“有助于”应该用“helped”，结合短语“help (to) do”可知“保存”用动词原形，所以正确答案为A选项。 【干扰项排除】B、C、D选项均不符合语法规则。 【句意】当时许多人认为香料有助于保存食物；然而，霍尔发现许多市场上销售的香料充满了细菌、霉菌和酵母。
