【摘要】：I arrived at a building in front of which grow many trees.=>I arrived at a building, and many trees grow in front of it.They went into the classroom in the center of which stands a large table.=>They went into the classroom, and a large table stands in the center of it.
I arrived at a building in front of which grow many trees.
=>I arrived at a building, and many trees grow in front of it.
They went into the classroom in the center of which stands a large table.
=>They went into the classroom, and a large table stands in the center of it.
关系代词as（as...as..., such as, the same as/that）
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