______objects in the distance is made possible with the help of a telescope.

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问题 ______objects in the distance is made possible with the help of a telescope.

选项 A、Observation
B、Observatory
C、Observed
D、Observing

答案D

解析 本题考查非谓语动词形式。______object in the distance是句子的主语,而这个短语中object是宾语,所以前面一空应该要填非谓语动词,故A和B排除。因为观察物体是主动行为,所以应该选用现在分词,故答案选D。
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