she was frightened and ___what was wrong with him,at once rang up the doctor.

she was frightened and ___what was wrong with him,at once rang up the doctor.
a not kowning b.didn't kown 答案是not kowning 为什么?
英语人气:894 ℃时间:2019-08-21 20:10:42
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A
分词短语在此作原因状语
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