When we______the world’s economic development on a timeline we can see periods in which certain business sectors experienced an

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问题 When we______the world’s economic development on a timeline we can see periods in which certain business sectors experienced an economic boom.

选项 A、examine
B、examines
C、examining
D、examination

答案A

解析 空格前出现了主语we,空格后出现了宾语the world’s economic development,因此我们可以推断出空格中需要填一个动词。选项中可以作动词使用的有(A)和(B)。因为主语是we(复数),所以不能填入用于第三人称单数形式的(B)examines.(A)ex-amine是正确的。
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