102 câu trắc nghiệm Thì quá khứ tiếp diễn (Past Continuous) có đáp án

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My dad found some money while he _____ his suitcase.

2/102

My dad found some money while he _____ his suitcase.

packing

package

are packing

was packing

Giải thích

Chọn đáp án D