Experts say the space rock is probably ______ more than $30,000.

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问题 Experts say the space rock is probably ______ more than $30,000.

选项 A、weighty
B、costly
C、valuable
D、worth

答案D

解析由于前面有一个系动词is，只有worth一词才正确。is worth...意为costs...。A和C两个选择项不符合本句的用法。

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GCT工程硕士（英语）

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