17000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 3)

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

449/1620

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