By the time Einstein was 14 years old, he ________ himself advanced mathematics.
#104517
A
has taught
B
taught
C
had taught
D
was teaching
推荐题目
My uncle _____ to see me. He’ll be here soon.
#102876
A
comes
B
is coming
C
had come
D
came
—Can I come after dinner?—Yes, that's fine. I ________ anything.
#99464
A
don't do
B
won't do
C
won't be doing
D
am not doing
The old worker has been fired and now a young man ______.
#99876
A
took place
B
has taken the place
C
takes place of him
D
has taken his place
 The pen      well, so it ___ well. 
#101517
A
is written, is sold
B
is writing, is selling
C
is written, sells
D
writes, sells