YDS NOUN CLAUSES / TEST 1 21. Soru

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100 %

21.

- For the last few weeks, medical teams ......... day
and night in an effort to find out exactly what
......... this terrible illness, but they've had little
success so far.

are working/will cause

have worked/will have caused

have been working/is causing

will have worked/will be caused

were working/had been caused

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