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1 . Scientists estimate it may be five or ten months ______________ it is possible to test this medicine on human patients.
A.since | B.after | C.before | D.when |
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2 . Tim was happy to take on all the housework ________ his wife went out to work.
A.while | B.until | C.before | D.since |
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3 . — Did you explain it to your boss?
— No. He stormed out of the office______I could get in a word.
— No. He stormed out of the office______I could get in a word.
A.since | B.when | C.before | D.after |
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4 . Scientists say it may be a few months ____vaccination(疫苗接种) for the epidemic of COVID-19 is widespread throughout the country.
A.until | B.after | C.before | D.since |
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