—Where is Bruce? Is he at home?

—I think he _____ school. [ ]

A. has gone                          

B. has been  

C. has gone to                        

D. has been to

同妊娠期 * * 变化无关的激素是（）

A.孕激素

B.雌激素

C.胰岛素

D.催乳激素

E.甲状腺素