_____  have you been like this?
A．How oftenB．How many
C．How longD．How old
C

試題分析：句意:你像這樣多長時間了？A. How often多久一次，詢問頻率；B. How many多少，修飾可數(shù)名詞； C. How long 多久，詢問時間； D. How old多大，詢問年齡。有句意可知選C。
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