Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions The production of tin ore in the United States is relatively insignifican

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

The production of tin ore in the United States is relatively insignificant, ____ less than one hundred tons annually

amount to

in the amount

amount to it

to the amount of

Giải thích

Đáp án D

to the amount of: đến mức

Câu này không chọn được đáp án A. amount to vì đây là giảm mệnh đề quan hệ nên động từ amount phải chia là amounting