题目内容:
He( )with Smith at least four times in the past three years.
A.has been seen to meet
B.was seen to meet
C.had been seen meeting
D.is seen meeting
参考答案:
答案解析:
He( )with Smith at least four times in the past three years.
A.has been seen to meet
B.was seen to meet
C.had been seen meeting
D.is seen meeting