题目内容

A spaceship flies at about eleven kilometers ________ second．

A.
/
B.
the
C.
a
D.
an

C
解析：
这里用不定冠词a/an来表示“每一”的意思．因为second是以辅音音素开头的单词．

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B: 1

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B: 2

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B: 3

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A: 4

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A: Sounds great. 5

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A spaceship flies at about eleven kilometers ________ second．

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