Choose the correct answer to each of the following questions or choose the best rewritten sentences.

Câu hỏi

Rarely ______located near city lights or at lower elevations.

A. observatories are

B. have observatories

C. in the observatories

D. are observatories

Đáp án
D. are observatories

Câu hỏi thuộc Bài tập:

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