Don't put off _______ a travel plan. It's time for us to start.[ ]

A. to make            

B. makes

C. made          

D. making

慢粒白血病加速期的主要表现是()

A．骨关节痛

B．体重下降

C．进行性贫血

D．脾脏迅速肿大

E．原因不明的高热