Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đáp án (Đề 5)

No one knows (79) ………………….. many people speak it as a foreign language.

79/105

No one knows (79) ………………….. many people speak it as a foreign language.

0/3000 ký tự
Giải thích

No one knows (79) how many people speak it as a foreign language.