专科护士最早在美国提出并实施，最初的专科护士始于：（）。
A.十九世纪初期
B.十九世纪中期
C.二十世纪初期
D.二十世纪中期
参考答案：C
Last time you your umbrella at school. Today you mustn' t ________ it any more. [ ]
A. forgot; leave
B. left; leave
C. forgot; forget
D. left; forget
Planning so far ahead _____ no sense — so many things will have changed by next year.
A．made
B．is making
C．makes
D．has made
