He has _________ good knowledge of science and _________ sense of humour．
He has _________ good knowledge of science and _________ sense of humour．
A.a,/
B.a, a
C./, a
D./,/
答案及解析： B
He has _________ good knowledge of science and _________ sense of humour．
A.a,/
B.a, a
C./, a
D./,/
答案及解析： B