100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án

Before I came to Northern Europe I ________ snow!

21/100

Before I came to Northern Europe I ________ snow!

had never seen

had never been seeing

never seen

never been seeing

Giải thích

Chọn đáp án: A