100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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The doctor took off the plaster that he (put on) six weeks before.

92/100

The doctor took off the plaster that he (put on) six weeks before.

Has put on

Had put on

Had been putting on

Has been putting on

Giải thích

Chọn đáp án: B