题目内容

Her family invited me ______ with them for a few weeks.

A. to stay
B. stay
C. staying

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---I have never been to Beijing.---______ have I.

A. So
B. Neither
C. Not

1. I do not ______what you mean.2. Don’t______! Stay where you are.3. She has made him a______ cake for his birthday.4. At that time some people______children really badly; they did not even give them food sometimes.5. He was a ______ businessman; he just wanted money.

2ASK、2FSK、2PSK、2DPSK中,2FSK可靠性最好。

A. 对
B. 错

2ASK、2FSK、2PSK、2DPSK中,2FSK有效性最好。

A. 对
B. 错

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