I doubt _______ they can complete the bridge ahead of time.
A、whetherB
这里表示的是：来的方式，要用how.
We______to go to the supermarket because we had plenty of food.
Janeisrestless;sheis_____animportantphonecallfromherparents.
Ifyouhavedifficultylocatingaparticularbook，pleaseaskourlibrariansfor___(assist).
I_____him150dollarsandmustpayhimbacktomorrow.
The black writer wanted the other members of the workshop to treat_________as an equal.
