问题

They __________ each other for more than 5 years.
A:know
B:knew
C:will know
D:have known;
B:knew
C:will know
D:have known;
正确答案是:
同类题型
When shall we meet tomorrow—Let’s ______ half past nine in the morning.
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The windows musthave taken you quite a long time that day ——RightThey for weeks