Susan ______knew that she had to work more diligently to be admitted into the master’s program.
A、impulsively
B、instinctively
C、arbitrarily
D、simultaneously
【正确答案】：B
【题目解析】：impulsively冲动地。instinctively本能地，凭直觉的。arbitrarily任意地，随意地。simultaneously 同时地。句意：苏珊本能地知道，要想考上硕士，她必须更加努力地学习。
