100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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When she arrived, the kids ________ in the sandbox for hours.

69/100

When she arrived, the kids ________ in the sandbox for hours.

played

have been playing

had played

had been playing

Giải thích

Chọn đáp án: D