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

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My mom ________ in the sea when she saw a dolphin.

25/102

My mom ________ in the sea when she saw a dolphin.

was swimming

was swum

were swimming

were swum

Giải thích

Chọn đáp án: A