Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đáp án (Đề 6)

he was so worried about (61) ________ his 100% attendance that

48/93

he was so worried about (61) ________ his 100% attendance that

filling

В. maintaining 

С. guarding     

succeeding

Giải thích

Chọn đáp án B