As the sea ice melts sooner each swimmer,polar bears are forced to come ashore e
题型:江西省同步题难度:来源:
As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season. |
[ ] |
A .before B. unless C. since D. until |
答案
A |
举一反三
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