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单选题
48.Opportunities are always available ()one uses his mind.( )
A
as long as
B
as
C
unless
D
in case
答案解析
正确答案：A
解析：
这是一道关于连词选择的单选题。首先，我们需要理解题干的意思和每个选项的含义。
题干：“Opportunities are always available () one uses his mind.” 这句话的意思是：“只要某人动脑筋，机会就总是存在的。”
接下来，分析各个选项：
* A: as long as - 只要，表示条件关系，符合题干语境。
* B: as - 作为，当……时，不符合题干语境，因为题干表达的是条件关系，而不是身份或时间关系。
* C: unless - 除非，表示否定条件，与题干意思相反。
* D: in case - 以防万一，表示预防某种情况发生，与题干语境不符。
根据题干语境和各选项的含义，可以判断“as long as”最符合题意，表示“只要某人动脑筋，机会就总是存在的”。
因此，正确答案是A。
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