Do you know a spaceship flies at about nineteen kilometers ________ second?
A.theB.a(chǎn)C./D.a(chǎn)n
B
句意:你知道宇宙飛船以每秒十九千米的速度飛行嗎?結(jié)合語境可知本句中泛指任何一秒,故用不定冠詞。Second詞首音素是輔音,故不定冠詞用a,選B。
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