题一:
_____ basic first-aid techniques will help you respond quickly to emergencies.
a. known b. having known c. knowing d. being known
题二:
anyone, once ____ positive for h7n9 flu virus, will receive free medical treatment from our government.
a. to be tested b. being tested c. tested d. to test
题三:
i got to the office earlier that day, ______ the 7:30 train from paddington.
a. caught b. to have caught c. to catch d. having caught
题四:
the driver wanted to park his car near the roadside but was asked by the police_____.
a. not to do b. not to c. not do d. do not
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