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

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The man _____ his letter in the post office at that time.

9/102

The man _____ his letter in the post office at that time.

is sending

was sending

sending

was sending

Giải thích

Chọn đáp án B