【单选题】以下程序片段,下列哪个选项插人到第2行将引起编译错误? ( ) package mypackage; //第二行 class MyClass{ //do something }
A.
public class MainClass{ }
【单选题】The evaporating pressure in R22 vapor compression refrigeration plant should be _____ atmospheric.
【单选题】There is considerable pressure on teenagers to ______.
【单选题】Amy ____ the school library. She ______ books three times a week.
A.
has gone to; has used to borrow
B.
has been to; used to borrow
C.
has gone to; has been used to borrowing
D.
has been to; is used to borrowing
【单选题】—Is your brother at home? —No. He _______ the library. [ ]