The professor worked for 7 hours at a ________.
A、stretchA
此题考查的是固定词组搭配。atastretch一口气地。
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.
Ithasbeenfoundthatastrong________helpovercometheeffectsofdistraction.
When_______,waterwillbeturnedintosteam.
Theyshouldtryto________theirusualinhibitionsandjoininthefun.
Sincewehaveafocusedsubject，weshouldnottalk________.
