—How long have you been ill? —______.

admin2009-07-17  21

问题 —How long have you been ill?   —______.

选项 A、Since last week
B、A week ago
C、Once a week

答案A

解析 问句用了现在完成时,回答要与之保持一致。此处是一省略句,用 since时间状语说明省略部分要用完成时;用a week ago说明动词须用过去时;用once a week说明动词要用一般现在时。
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