Good friends are like stars. You don’t always see them, ______ you know they are there.
| A．as | B．but |
| C．for | D．then |
相关试题
—Listen ! Helen is singing in the next room.
—It __________ be Helen. She is in Tianjin now.
| A．can’t | B．mustn’t | C．may not | D．shouldn’t |
_________ exciting match it is! Wonderful players and wonderful teams!
| A．What | B．What a | C．What an | D．How |
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