问题描述：
sat oc 语法题
By the end of the eighteenth century, watchmaking technology had greatly improved, （and they were standard equipment for military personnel.）
(A)and they were standard equipment for military personnel
(B)so it was standard equipment for military personnel to have watches
(C)with watches included in the standard equipment for military personnel
(D)and watches had become standard equipment for military personnel
(E)and for military personnel it was standard equipment
答案是D B哪里错了 it不可以做形式主语吗
By the end of the eighteenth century, watchmaking technology had greatly improved, （and they were standard equipment for military personnel.）
(A)and they were standard equipment for military personnel
(B)so it was standard equipment for military personnel to have watches
(C)with watches included in the standard equipment for military personnel
(D)and watches had become standard equipment for military personnel
(E)and for military personnel it was standard equipment
答案是D B哪里错了 it不可以做形式主语吗
问题解答：
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