单选题The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.AbecauseBthoughCsinceDuntil
单选题
The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.
A
because
B
though
C
since
D
until
参考解析
解析：
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