100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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Priscilla ________ information about an accident for two days, when the thief stole her notes. 

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Priscilla ________ information about an accident for two days, when the thief stole her notes. 

had gathered

was gathering

had been gathered

had been gathering

Giải thích

Chọn đáp án: D