There ______ little change in the patient’s condition since he w

There ______ little change in the patient’s condition since he was taken to the hospital.
A、is
B、has been
C、have been
D、was
【正确答案】：B
【题目解析】：由since 可判断要使用现在完成时，因此排除AD ，根据后面的little change可知，这里要用单数。因此答案选B