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?
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![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?](/uploads/image/z/9689649-33-9.jpg?t=she+was+frightened+and+___what+was+wrong+with+him%2Cat+once+rang+up+the+doctor.a+not+kowning+b.didn%27t+kown+%E7%AD%94%E6%A1%88%E6%98%AFnot+kowning+%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
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?
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?
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?
A
分词短语在此作原因状语
not knowing表示当时的一种状态,而didn't know只表示时间上是过去发生的。好好思考一下吧!