1.The city was taken,the inhabitants fled.

2.A man escaped from the prison last night.It was a long time when the guards discovered what had happened.

3.You can arrive in Beijing earlier for the meeting unless you don’t mind taking the night train.

【答案】

1.【解析】应该将was taken改为having been taken。该题考察独立主格结构的用法。

2.【解析】应该将when改为before。该题考点为句型“It is/was/will be…(time)before….”的用法,意为“过了…(时间)才…”

3.【解析】应该将unless改为provided。该题考察引导条件状语从句的连词。此处provided可以当if理解和使用,用unless不合题意。
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