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The manager entered the office and was happy to learn that f

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The manager entered the office and was happy to learn that four fifth of the tickets ( ).
A:was booked B:had been booked C:were boooked D:have been booked.
这句话什么意思?答案是哪一个?为什么?
The manager entered the office and was happy to learn that f
B
主管进了办公室,听说五分之四的票都定出去了很高兴
因为主句从句语态要对应,主句是过去时,从句用过去完成时.
所以不可以用现在完成时
强调动作已经发生,所以要用完成时,不能用一般过去时