100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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My scores in high school ________ until I made an effort to study more.

53/100

My scores in high school ________ until I made an effort to study more.

couldn't be improved

hadn't been improved

haven't been improving

wouldn't have improved

Giải thích

Chọn đáp án: B