2019年mpacc考试英语真题——连词984

{01}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

解析：本题考查名词性从句。句中where引导宾语从句，在从句中作地点状语。句意：当宇航员返回到地球大气层的时候，直升机飞往他们将降落的地方，准备运走他们。
本题选B。
{02}   The UN has warned that,_____ natural systems like forests and wetlands disappear , mankind is losing the services they provide such as protection from extreme weather.

A.while

B.once

C.when

D.as

解析：略
本题选D。
{03}The newly built café, the walls of_______ are painted light green, is really a peaceful place for us, specially after hard work.

A.that

B.it

C.what

D.which

解析：略
本题选D。