1.A number of art works are believed _____ during World War II.
A. being stolen B. having been stolen
C. to be stolen D. to have been stolen
2.In his pioneering work, David explains how languages come into being, _____ that children
are the driving force.
A. being argued B. having argued
C. arguing D. agued
3.Birdwatching is becoming a popular pastime, with almost 3,000,000 of us _____ in our
fluttering feathered friends.
A. absorbed B. absorbing
C. absorb D. to absorb
4.The course “World Literature” examines the common people found in quality literature
worldwide and _____ a variety of cultural background.
A. introduces B. introducing
C. to introduce D. introduced
悬赏这些财富是因为希望大家能解答的详细一些,还有碰到这类问题怎样才能少错