A Wechat (微信) is an invention __________ can help people talk to friends, share photo, ideas and feelings freely.
#42631
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which
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— Have you found the information is about President Xi’s visit to Russia?— Not yet. I will surf the Internet.
#42969
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what
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whom
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They want to develop a kind of dog-friendly food _________ will help dog owners cool down their pets.
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what
C
which
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－I can’t find the bookstore _____ my father bought the book for me yesterday.
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B
which
C
when
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