问题描述:
____ he ___ go to work by ferry before the bridge was built?
a.Did; used to b.Did; use to
为什么选B?Did引导疑问,use就不用used了吗?
a.Did; used to b.Did; use to
为什么选B?Did引导疑问,use就不用used了吗?
问题解答:
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