when ____ in arctic regions,they construct huts as temporary winter shelters.A travel B traveled C traveling D they traveledthese compounds could not have formed if the chemical reaction _____ stopped.A has been B was C would have been D had been第
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![when ____ in arctic regions,they construct huts as temporary winter shelters.A travel B traveled C traveling D they traveledthese compounds could not have formed if the chemical reaction _____ stopped.A has been B was C would have been D had been第](/uploads/image/z/15043561-25-1.jpg?t=when+____+in+arctic+regions%2Cthey+construct+huts+as+temporary+winter+shelters.A+travel+B+traveled+C+traveling+D+they+traveledthese+compounds+could+not+have+formed+if+the+chemical+reaction+_____+stopped.A+has+been+B+was+C+would+have+been+D+had+been%E7%AC%AC)
when ____ in arctic regions,they construct huts as temporary winter shelters.A travel B traveled C traveling D they traveledthese compounds could not have formed if the chemical reaction _____ stopped.A has been B was C would have been D had been第
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?
when ____ in arctic regions,they construct huts as temporary winter shelters.A travel B traveled C traveling D they traveledthese compounds could not have formed if the chemical reaction _____ stopped.A has been B was C would have been D had been第
C traveling 表示状态,时间状语
D had been 虚拟语气
C D
C traveling 形式主语
A has been