Halley’s Comet had its first documented sighting in 240 B.C. in China and ………..it has been seen from the Earth 29 times. 

Câu hỏi :

Halley’s Comet had its first documented sighting in 240 B.C. in China and ………..it has been seen from the Earth 29 times. 

A  after   

B because of

C since then

D that is

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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