HER ACADEMIC PERFORMANCE HAS GREATLY IMPROVED SINCE SHE ………

Câu 22 (TH):

Her academic performance has greatly improved since she ………. her

study methods.

A.

changed

B.

will change

C.

would change

D.

was changing

Mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that is

CLOSEST in meaning to the underlined part in each of the followings.