【正确答案】 A

【答案解析】[理由] 空格前有句子，空格后也有主语the discs引导的句子。得知两句须有连接词连接。
in that+S+V因为……(视作连接词)
=because+S+V
[例] John is smart in that he can speak five different languages.
(约翰很聪明，因为他会说5种不同的语言。)
except that+S+V 只可惜……
(视作连接词)
[例] John is nice except that sometimes he may lose his temper.
(约翰人很好，只可惜偶尔会发脾气。)
for that(非连接词)
with that(非连接词)
选项中仅(A)及(B)为连接词，但是按语意仅(A)为正选。