when he heard the bell,he ran into the classroom ____?A.just now B.at once C.in a minute D.now为神马是B?不是A么?

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whenheheardthebell,heranintotheclassroom____?A.justnowB.atonceC.inaminuteD.now为神马是B?不是A么?whenheheard

when he heard the bell,he ran into the classroom ____?A.just now B.at once C.in a minute D.now为神马是B?不是A么?
when he heard the bell,he ran into the classroom ____?A.just now B.at once C.in a minute D.now
为神马是B?不是A么?

when he heard the bell,he ran into the classroom ____?A.just now B.at once C.in a minute D.now为神马是B?不是A么?
just now意为刚才,是过去世的标志.
at once意为立即,与选题意思相符!

at once 立即
just now 刚才
句意:当他听见铃声,他立即跑进了教室。