18. He knocked at the door _________ no one answered.

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18.Heknockedatthedoor_________nooneanswered.18.Heknockedatthedoor_________nooneanswered.18.Heknocked

18. He knocked at the door _________ no one answered.
18. He knocked at the door _________ no one answered.

18. He knocked at the door _________ no one answered.
but,转折关系

but

but