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题目内容
（国家开放大学理工英语4）
______no modern telecommunications, we would have to wait for weeks to get news from around the world.
单选题 (10 分) 10分
A.
Were there
B.
If there are
C.
If there have been
单选题 (10 分) 10分
A.
Were there
B.
If there are
C.
If there have been
参考答案