A new railway ____ in this city next year.
A. is built
B. will built
C. will be built
D. build
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Tom ______ in the library every night over the last three months.
A. works
B. worked
C. has been working
D. had been working
Did you predict that many students ______ up for the dance competition?
A. would sign
B. signed
C. have signed
D. had signed
By the time you arrive this evening, I ____ for two hours.
A. will study
B. will have been studied
C. had studied
D. will have been studying
请问二极管最典型的特性是什么？
A. 光生伏特效应
B. 单向导电性
C. 双向导电性
D. 折射效应
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