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.

5/102

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

was swimming

is swimming

were swimming

are swimming

Giải thích

Chọn đáp án A