单项选择题

(), he felt too nervous to speak

A. Having been watched by a crowd of people
B. Watching by a crowd of people
C. Having watched by a crowd of people
D. Being watched by a crowd of people

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单项选择题

At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly () to another subject

A. committed
B. switched
C. favoured
D. transferred

单项选择题

The boy has four appels: two yellow() and two red

A. one; one
B. one; ones
C. ones; other
D. ones; ones