【C4】A．partB．toolC．instrumentD．organ

Prepositions（介词) ____ in the structure of English.A、take partB、take a great partC、pla

They stopped in a cafe for a drink and a ______ of cake.A．partB．littleC．piece

【C3】A．partB．pointC．answerD．solution

I have several plans in my mind, but one______seems good and feasible.A．in partB．in partic

The singer said he couldn’t play any ______.A: treatmentB: movementC: instrumentD: impr

OSI参考模型中的OSI表示的是（)。A.Organization Standard InstituteB.Organization Standard Inte