There are still many problems ______ before we are ready for a long stay on the Moon.
#88396
A
solving
B
solved
C
being solved
D
to be solved
推荐题目
I happened_______with him when he was hit by a stone.
#97417
A
I was talking
B
talking
C
to talk
D
to be talking
The audience were deeply impressed by his speech with tears _________ their eyes.
#96593
A
to fill
B
filling
C
filled
D
to be filled
by a greater demand of vegetables, farmers have built more green houses.
#96670
A
Driven
B
Being driven
C
To drive
D
Having driven
According to some theories ________ from psychoanalysis, life is supposedly easier; and more pleasant when anxiety is overcome.
#95239
A
obtain
B
obtaining
C
to obtain
D
obtained
_______ the TV, Tom began to read newspaper.
#89694
A
Turned off
B
Turn off
C
To turn off
D
Having turned off