题目内容：
回答第54空。
A．A are B．B will be
C．C is
D．D was
参考答案：
答案解析：
单选题：回答第54空。
- 题目分类：理工类
- 题目类型：单选题
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B．B will be
C．C is
D．D was
B．B will be
C．C is
D．D was
根据以下资料，回答题。请在第（46）处填上最佳答案。
根据以下资料，回答题。请在第（46）处填上最佳答案。
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