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【单选题】
“It was several years before other sports were added.”Which of the following means the same?A.
Before several years passed，other sports were added.
B.
Other sports were not added until several years later.
C.
Several years passed after other sports were added.
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反馈参考答案：
举一反三
【单选题】一个实际的正弦波振荡器绝大多数属于正反馈电路，它主要的组成部分是（）
A.
放大电路和反馈网络
B.
放大电路、反馈网络和稳频网络
C.
放大电路、反馈网络和选频网络
D.
放大电路、反馈网络和调幅网络
【单选题】— What's the matter with Tom? — He lost his purse. He seems ______. [ ]
A.
to cry
B.
crying
C.
cry
D.
cried
【单选题】一个实际的正弦波振荡器绝大多数属于正反馈电路，它主要的组成部分是（ ）
A.
放大电路和反馈网络
B.
放大电路、反馈网络和选频网络
C.
放大电路、反馈网络和调幅网络
D.
放大电路、反馈网络和稳频网络
【简答题】____正弦波振荡器属于正反馈电路,它主要由放大器、反馈网络和选频网络成。
【单选题】He couldn’t help ________ when he heard the sad news.
A.
to cry
B.
crying
C.
cried
D.
cry
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