The children___ tired after running for thirty minutes half an hour ago.a.feel b.felt c.will feel d.are feeling

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The children___ tired after running for thirty minutes half an hour ago.
a.feel b.felt c.will feel d.are feeling

b 句子意思是小孩子在半小时之前跑了30分钟之后 感到很累.
半小时前,说明已经过去.所以过去式.

选 B
half an hour ago. 半小时前,可知是过去时