Bộ 20 đề ôn thi vào Chuyên Anh năm 2023 có đáp án (Đề 13)

There has to be this starting and stopping movement the eye can only see only when it is not moving.

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There has to be this starting and stopping movement __________the eye can only see only when it is not moving.

because

although

when

while

Giải thích

Chọn A