—Where can I find Martin?Dad is asking for him.
—He in the backyard chopping wood.
A. supposes to stay
B. is supposed to stay
C. supposes staying
D. is supposed staying
网友回答
A. supposes to stay
(答案→)B. is supposed to stay
C. supposes staying
D. is supposed staying
解析：be supposed to do sth.“据认为，应该是”。