单项选择题

When()that the principal was very strict, he didn't dare go to the office alone.

A. tell
B. told
C. was telling
D. telling

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单项选择题

The new tax law will not take()until next month.

A. action
B. place
C. office
D. effect

单项选择题

These overseas experts came from all()of life in different countries.

A. runs
B. steps
C. lines
D. walks

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