题一:
there are some health problems that, when ______ in time, can become bigger ones later on.
a. not treated b. not being treated c. not to be treated d. not have been treated
题二:
i took my driving license with me on holiday, _________ i wanted to hire a car.
a. in case b. even if c. ever since d. if only
题三:
she says that she’ll have to close the shop ________ business improves.
a. if b. unless c. after d. when
题四:
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