Navigators on ships and aircraft use a compass to determine______they are heading.

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问题 Navigators on ships and aircraft use a compass to determine______they are heading.

选项 A、the direction in which
B、to where the direction
C、that direction of which
D、where the direction

答案A

解析 本题考查句子结构和定语从句。determine为及物动词,须跟上宾语。空格后的they are heading为句子的第二套主语结构,因此空格处需要填入从句连接词。综合起来,只有A选项符合要求:direction为determine的宾语,which(in为定语从句中介词前置于关系代词前)引导定语从句修饰direction。故本题答案为A。
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