单项选择题

The BBC has just successfully demonstrated a new digital radio ______ system.

A. transaction
B. transition
C. transmission
D. transformation

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单项选择题
Which of the following italicized phrases indicates reason
A. It’s a machine for slicing bread.
B. He was sent to prison for robbery.
C. Passengers for Tianjin must change at Beijing.
D. The shop sent me a bill for $50.
单项选择题
In phrases like a charming village, an astonishing fact, the -ing participle is used as a ______.
A. command
B. condition
C. description
D. concession
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