However, the researchers say the study is ________ (5) and therefore cannot establish a definite cause.
A. observant
Đáp án B
Kiến thức về từ loại
A. observant /əbˈzɜː.vənt/ (n): tinh mắt, hay quan sát
B. observational /ˌɒb.zəˈveɪ.ʃən.əl/ (a): thuộc sự quan sát
C. observatory /əbˈzɜː.və.tər.i/ (n): đài quan sát
D. observe /əbˈzɜːv/ (v): quan sát
Tạm dịch: “However, the researchers say the study is ________ (5) and therefore cannot establish a definite cause.”
(Tuy nhiên, những nghiên cứu sinh nói rằng nghiên cứu đó thuộc về sự quan sát và vì vậy không thể đưa ra nguyên nhân rõ ràng.)
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