YDS THE PASSIVE / TEST 5 25. Soru

Bu Testin Birincisi echointhedistan

100 %

25.

- Numerous expeditions, which ........ by
various countries, ........ since the first
successful climb of Mount Everest.

are sponsored/are being undertaken

were sponsored /have been undertaken

have sponsored/will be undertaking

have been sponsored/undertook

had sponsored/will have undertaken