100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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By the time he decided to call her, she ________ (try) to reach him for hours.

85/100

By the time he decided to call her, she ________ (try) to reach him for hours.

tried

had tried

had been trying

was trying

Giải thích

Chọn đáp án: C