I stood there patiently until he ________ his work.
#103684
A
has finished
B
would finish
C
had finished
D
finishes
推荐题目
Although the causes of cancer ________, we do not yet have any practical way to prevent it．
#103264
A
have uncovered
B
have been uncovering
C
are uncovering
D
are being uncovered
When the old man ______ to walk back to his house, the sun ______ itself behind the mountain.
#100109
A
started; had already hidden
B
was starting; hid
C
had started; had already hidden
D
had started; was hiding
—Tommy is planning to buy a car.—I know. By next month he _____ enough for a used one.
#100921
A
will have saved
B
saved
C
will save
D
saves
Although medical science________control over several dangerous diseases，what worries us is that some of them are recurrent.
#99174
A
achieved
B
has achieved
C
will achieve
D
had achieved
_______ for many times, he still hopes to win.
#99790
A
Failing
B
Failed
C
Having failed
D
To have failed