Several weeks had gone by ______ I realized the painting was missing.a、as b、 before c、 since d、 that这题选b,为什么连接词之前有个by?

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• Several weeks had gone by ______ I realized the painting was missing.a、as b、 before c、 since d、 that这题选b,为什么连接词之前有个by?
• Several weeks had gone by ___I realized the paining was missing .6.Several weeks had gone by _b_ I realized the painting was missing.a、as b、 before c、 since d、 that 为什么选b
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• Several weeks had gone by ___I realized the paining was missing .6.Several weeks had gone by _b_ I realized the painting was missing.a、as b、 before c、 since d、 that 为什么选b