100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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Once Sally saw me , I ________ for three hours.

62/100

Once Sally saw me , I ________ for three hours.

had gardened

had been gardening

was gardening

gardened

Giải thích

Chọn đáp án: B