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.

29/102

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

is sending

were sending

sending

was sending

Giải thích

Chọn đáp án: B