问题
选择题
The man called his professor for help because he couldn’t solve the problem by _________.
A．herself
B．himself
C．yourself
D．themselves
答案
答案：B
herself她自己；himself 他自己；yourself你们自己，你自己；themselves他们自己。句意：这个人向他的教授请求帮助，因为他不能独自解决这个问题。结合语境可知下文反身代词指代的是前文的the man，男性，单数，故选B。