John and I ________ friends for eight years. We first got to know each other at a Christmas party. But we _______ each other a couple of times before that.
| A．had been; have seen | B．have been; have seen |
| C．had been; had seen | D．have been; had seen |
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All passengers are expected to fasten the seatbelts when the plane takes off and lands.
| A．on the board | B．on board | C．on a board | D．on boards |
I was really anxious about you. You _______ home without a word .
| A．mustn’t leave | B．couldn’t have left |
| C．needn’t leave | D．shouldn’t have left |
Please find some books that _____________ these matters.
A. light upon B. give light upon
C. throw light upon D throws light upon
usually go there by train.相关知识点
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