Mr Black ___(leave) his keys in the office,so he had to wait until his wife ___(come) home.

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Mr Black ___(leave) his keys in the office,so he had to wait until his wife ___(come) home.
Mr Black ___(leave) his keys in the office,so he had to wait until his wife ___(come) home.

Mr Black ___(leave) his keys in the office,so he had to wait until his wife ___(come) home.
had left 这个动作发生在 后面的come之前,具有比较性,用过去完成时态
后面的而用一般过去时态,came

left, came

had left......came

Mr.Black left his keys in the office ,so he had to wait until his wife came home.

left , comes

left came