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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Someone ____________must have picked it up by mistake.
A. currently
B. fortunately
C. luckily
D. obviously
Someone ____________must have picked it up by mistake.
A. currently
B. fortunately
C. luckily
D. obviously
Obviously (adv): rõ ràng là
Fortunately/ luckily (adv): may mắn là
Fortunately/ luckily (adv): may mắn là
Đáp án D.