you'd better find out___they are up to before opening the door.A.what B.that C.as D.wherethey are up 选什么?

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you''dbetterfindout___theyareuptobeforeopeningthedoor.A.whatB.thatC.asD.wheretheyareup选什么?you''dbetter

you'd better find out___they are up to before opening the door.A.what B.that C.as D.wherethey are up 选什么?
you'd better find out___they are up to before opening the door.
A.what B.that C.as D.where
they are up 选什么?

you'd better find out___they are up to before opening the door.A.what B.that C.as D.wherethey are up 选什么?
选A
what they are up to 他们在做什么