PRACTICE TEST 5- Đại từ nhân xưng, Đại từ sở hữu và Đại từ phản thân
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______ he left, he made sure he had his keys with him. A. As though B. If only C. Before D. Unless

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______ he left, he made sure he had his keys with him.

As though

If only

Before

Unless

Giải thích

Chọn đáp án C