--How did she get infected? --She ________the virus without any protection.
#100265
A
exposed to
B
had been exposed to
C
had exposed to
D
was exposed to
推荐题目
 Experiments of this kind _______in both the U.S. and Europe well before the Second World War started.
#100664
A
have conducted
B
have been conducted
C
had conducted
D
had been conducted
Having you ever ______ in front of thousands of people at a concert, with everyone _____ while you were singing?
#102239
A
dreamed of to be; clapped
B
dreamt to be; to clap
C
dreamed of being; clapping
D
dream of being; to be clapping