题目列表(包括答案和解析)
—This returned scholar has become one of the top experts in this field.
—Yes, I know him very well. He ______ for ten years at an institute in the USA.
A. has worked B. has been working C. worked D. had worked
—This returned scholar has become one of the top experts in this field.
—Yes, I know him very well. He ______ for ten years at an institute in the USA.
A. has worked B. had worked C. worked D. has been working
―This returned scholar has become one of the top experts in this field.
―Yes, I know him very well. He ______ for ten years at an institute in the
A. has worked B. has been working C. worked D. had worked
―This returned scholar has become one of the top experts in this field.
―Yes, I know him very well. He ______ for ten years at an institute in the
A. has worked B. has been working C. worked D. had worked
—This returned scholar has become one of the top experts in this field.
—Yes, I know him very well. He ______ for ten years at an institute in the USA.
A. has worked B. had worked C. worked D. has been working
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