________ he took part in the competition, he won a second prize.
________ he took part in the competition, he won a second prize.
A.The first time
B.For the first time
C.At a time
D.At no time
答案及解析： A
________ he took part in the competition, he won a second prize.
A.The first time
B.For the first time
C.At a time
D.At no time
答案及解析： A