Which of the following choices is not the example of metaphorica

Which of the following choices is not the example of metaphorical linguistic expressions?
A、We're just spinning our wheels.
B、This relationship is a dead-end street.
C、I just can't swallow that claim.
D、I'm reading Shakespeare.
【正确答案】：D
【题目解析】：I'm reading Shakespeare.属于转喻性表达。