1）The company has a free long-distance telephone number ____

1）The company has a free long-distance telephone number _____customers may call with any questions they have about its products.
A although B as C even if D so that D
我选B,难道不开通电话顾客有问题就不打电话了?翻译成“因为”也满通的
2）Scientists say it may be five or ten years _______ it is possible to test this medicine on human patients
A since B before C after D when