单项选择题

We planned to（）some friends for the special occasion.

A.call out
B.call on
C.call over
D.call off

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Almost half of my classmates（）the Internet to use email.

A.contact with
B.take on
C.absorb into
D.log onto
单项选择题
The experienced lecturer started his speech （）a series of questions.

A.with
B.in
C.at
D.upon
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