问题

Mr. Green _______ his lessons when I went into his office.
A:prepares
B:prepared
C:is preparing
D:was preparing;
B:prepared
C:is preparing
D:was preparing;
正确答案是:
同类题型
I didn’t know the place very _______before. But now I’ve known _____about it.
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Let’s play tennis.—________. But I don’t have a tennis ball.
They are going to have a meeting with some famous tennis players.