The group of research workers are said to ________ to the dangerous nuclear radiation while they carried out their rescue task.

The group of research workers are said to ________ to the dangerous nuclear radiation while they carried out their rescue task.

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be exposed

have been exposed

exposed

be exposing

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 The science of the library is sometimes broken by a sudden cough or the sound of pages _______.

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turning

turned

being turned

having turned

Don’t enter the office unless _______.

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you have told to

told to

telling

you are told

Throughout history，the language________by a powerful group spreads across a civilization.

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speaking

spoken

to speak

to be spoken

--What do you think of cloning?--No doubt it’s a great invention. But ________, it may have some side effects.

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if not properly handling

if properly not handled

if not properly handled

if properly not handling

 Before leaving home, make sure to turn off the electricity, lock the door, ______ the windows open.

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and not to leave

instead of leaving

rather than leave

and not leave

共7470题