Aluminum isn’t found free in nature, owing to its always ____ with other elements, most commonly with oxygen.
#93060
A
being combined
B
having combined
C
combine
D
combined
推荐题目
Your idea surprised me, it is a(n) _____.
#98280
A
idea surprised
B
surprised idea
C
surprising idea
D
idea surprising
________in his test papers，he didn’t notice my coming.
#93747
A
Having absorbed
B
Absorbed
C
Absorbing
D
To be absorbed
In April , thousands of holidaymakers remained ______ abroad due to the volcanic ash cloud.
#91192
A
sticking
B
stuck
C
to be stuck
D
to have stuck
He tried to avoid________my questions in class.
#88502
A
to answer
B
answering
C
to have answered
D
having answered
He told us an interesting story about himself, _______________why he didn’t succeed that time.
#97865
A
explain
B
to explain
C
explained
D
explaining