题目内容
The first use of atomic weapons was in 1945, and their power ____increased enormously ever since.
A. is B. was C. has been D. had been.
of the household garbage recycled or reused since the new technology was applied.
A.Three-fourth; has B.Three-fourths; have
C.Three-fourths; has been D.Three-fourth; have been
The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since.
A. is B. was C. has been D. had been
—Where is Peter? —He _____ to Shanghai.
A.went
B.had gone
C.has been
D.has gone
AIDS is said the biggest health challenge to both men and women in that area over the past few years.
A. that it is B. to be C. that is has been D. to have been