I will visit Austria ______ the invitation of my friend this summer vacation．A．byB．forC．toD．at-高三英语

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• . Come _____. I’ll introduce my _____friend, Bob, to you.A．closely; close B．close; closelyC．close; c
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• . Playing on a frozen sports field sounds like a lot of fun. Isn't it rather risky, __9A．though
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