when ____ in arctic regions,they construct huts as temporary

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when ____ in arctic regions,they construct huts as temporary winter shelters.
A travel B traveled C traveling D they traveled
these compounds could not have formed if the chemical reaction _____ stopped.
A has been B was C would have been D had been
第二题到底应该是哪个答案呢？

C traveling 表示状态,时间状语
D had been 虚拟语气

The people of the village live in (neatly) ____ mud huts wit They ____(live)in beijing when they ___(get)married They ___ in Beijing when they ____ married. In the past decades,sea ice ______ in the Arctic as a result 英语翻译Polar bears live in the Arctic.They do not stay in one p They were ____ ( happy ) when they knew they failed in the e Over the past decades,sea ice ___ in the Arctic as a result ）Over the past decades,sea ice in the Arctic as a result of Some of us are trapped as ice in the Arctic.中trap的意思是什么? Over the past decades,sea ice ________ in the arctic as a re well last chrismas, i did two weeks as temporary,then in sum Arctic