Indications (that) the moon (underwent) a (heavy) bombardment (撞击) (date back) the early 1970s.

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问题 Indications (that) the moon (underwent) a (heavy) bombardment (撞击) (date back) the early 1970s.

选项 A、that
B、underwent
C、heavy
D、date back

答案D

解析追溯到……，从……开始。固定搭配：date back to。所以应将date back改为date back to。

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