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Once ________ at a table, left-handers need to move the water glasses put on the right side to their more convenient left side.
A.seatingB.having seatedC.seatedD.seat
C

试题分析:考查状语从句的省略,当主从句主语一致的时候,可以省略从句的主语和be动词,once seated="once" left-handers are seated,句意:当左撇子坐在桌子旁边的时候,他们需要把放在右边的水杯放在他们方便的左手这边,选C。
点评:当状语从句的主语与主句的主语一致,且状语从句中有系动词be的时候,可以把状语从句的主语和be动词一起省略。如果状语从句中有it is的时候,it is 也可以省略。
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