I doubt _______ they can complete the bridge ahead of time.
B
这里表示的是：来的方式，要用how.
When the ship lost its engine power,the crew found themselves at the_________of the wind.
Whenwereturnedfromourvacation,ournextdoorneighborswere______anewgaragebuilt.
Ifyouareunabletocometotheinterview,for______reasonyoushouldinformusaheadoftime.