问题描述：
which one is right?please tell me the detail.Thank you
In the reading-room there were tables,______you can sit there to read .A at which B in which Cwhere D and
The bicycle ______he often rides needs repairing.
A on which B in which C by which D with which
In the reading-room there were tables,______you can sit there to read .A at which B in which Cwhere D and
The bicycle ______he often rides needs repairing.
A on which B in which C by which D with which
问题解答：
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