When astronauts return to the earth's atmosphere, helicopters fly to________they would land, ready to collect them.

When astronauts return to the earth's atmosphere, helicopters fly to________they would land, ready to collect them.

1. A.
   what
2. B.
   where
3. C.
   which
4. D.
   that

 When astronauts return to the earth's atmosphere, helicopters fly to________they would land, ready to collect them.

A. what              B. where                   C. which                      D. that

When astronauts return to the earth's atmosphere, helicopters fly to          they would land, ready to collect them.

A．what            B．where           C．which          D．that

When astronauts return to the earth’s atmosphere, helicopters fly to________they would land, ready to collect them.

 When astronauts return to the earth's atmosphere, helicopters fly to          they would land, ready to collect them.

A. what           B. where                C. which            D. that

（2010·安徽合肥高三第一次教学质量检测） 27. When astronauts return to the earth's atmosphere, helicopters fly to          ______they would land, ready to collect them.

A. what    B. where        C. which        D. that

（2010·安徽合肥高三第一次教学质量检测） 27. When astronauts return to the earth's atmosphere, helicopters fly to          ______they would land, ready to collect them.

A. what    B. where        C. which        D. that