i am __ duty a.on b.in c.at d.to
i am __ duty a.on b.in c.at d.to
I am _______ duty this week A.in B.at C.on D.for
Who is ( )duty I am.A.in B.on c.of d.for
单选:Who's ( ) duty todoy?A.in B.at C.on D.to
I am going to read a book _____ science.A.for B.on C.in D.at
They are __ a visit __ London A in ;of B on; to C of;to D at
I am working hard ( )French.A.at B.for C.in D.on
i am () Room606.A:at ,B:on c:in D :behind
I am looking ___ my watch.A.for B.at C.to D.on
I am going to arrive ( ) Beijing at 8 am.A.to B.off C.in D.a
I am going there ____ my car A.by B.in C.to D.on
I am helping my mother___the housework.A.in B.to C.with D.on