Both of my brothers are now married ，so I have two_____.
B
“名词+副词/介词”或“副词/介词+名词”的复合名词，单数变复数时，只将中心名词变复数。如：on-look→on-looks;brother-in-law→brothers-in-law.
Copernicusmaintainedthattheearth_____roundthesun.
Hisarticleisbetterthan_____intheclass.
Thedriverpulled_____atthetrafficlights.
Childrenwhoareover-protectedbytheirparentsmaybecome_____.
He‘sworkinghard_____.