单项选择题

That was so serious a matter that l had no choice but ()the police.

A. called in
B. calling in
C. call in
D. to call in

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单项选择题
It is politely requested by the hotel management that radios()after 11 o'clock at night.

A. were not played
B. not to play
C. not be played
D. did not play
单项选择题
They took () measures to prevent poisonous gases from escaping.

A. fruitful
B. beneficial
C. valuable
D. effective
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