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Câu VI : Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Trả lời câu hỏi dưới đây:Thousand of antibiotics _______, but only about thirty are in common use today.

Câu VI :
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer

Câu hỏi

Nhận biết

Câu VI :

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Trả lời câu hỏi dưới đây:

Thousand of antibiotics _______, but only about thirty are in common use today.


A.
are developing
B.
have been developed
C.
have been developing
D.
have developed
Đáp án đúng: B

Lời giải của Luyện Tập 365

Antibiotic (n): thuốc kháng sinh.

Đáp án đúng là B. Chúng ta sử dụng thì hiện tại hoàn thành để diễn tả một hành động xảy ra ở một thời điểm không xác định trong quá khứ, thể hiện một quá trình.  Thêm vào đó, vì chủ ngữ là  danh từ chỉ vật, nên câu này chia ở thể bị động.

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