Each one of us who ______ now living is destined to witness remarkable scientific discoveries.

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问题 Each one of us who ______ now living is destined to witness remarkable scientific discoveries.

选项 A、is
B、are
C、have being
D、Were

答案B

解析 根据题意,who引导一定语从句,其谓语动词的性数应与定语从句所修饰的先行词取得一致。根据题意,who引导的定语从句的先行词为us,因此A可排除。根据定语从句中now一词,C和D可以排除,B为正确选择。
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