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.<br>A:because<br>B:though<br>C:since<br>D:until

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

出自：海船船员证

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