Tổng hợp đề thi thử tiếng anh thpt quốc gia (Đề số 31)

Due to ever more spreading poaching, there _____________ a dramatic decline in the

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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.

Due to ever more spreading poaching, there _____________ a dramatic decline in the number of elephants recently.

 

is

had been

was

has been

Giải thích

Chọn D