These diagrams are especially helpful when we have a concrete problem ______ at hand.
#90962
A
be solved
B
to solve
C
solved
D
being solved
推荐题目
Tim Bemers-Lee is generally considered ____ the World Wide Web, on which all the information is shared by all.
#98648
A
to have founded
B
having founded
C
founding
D
to found
In later years, people reported ____ a monster swimming across the lake.
#94741
A
to see
B
have seen
C
seeing
D
to have seen
They lived a hard life and were often made _______ for over ten hours a day.
#96659
A
work
B
to work
C
to working
D
worked
_____ carelessly, the boy made mistakes here and there. .
#97532
A
being written
B
Wrote
C
Write
D
Writing
He spent every minute he could _____ spoken English.
#97454
A
practise
B
to practise
C
practising
D
practised