So difficult______ it to acquire a large vocabulary without the help of a teacher that he was close to giving up .
#84229
A
he have felt
B
have he felt
C
he did feel
D
did he feel
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So fast ________ that I could not catch up with them.
#81143
A
did they run
B
they had run
C
they ran
D
had they run
Between the two windows was taken 10 years ago.
#79643
A
a picture hangs that
B
a picture hanging which
C
does a picture hang which
D
hangs a picture that
He failed the midterm examination and only then ________how much time he had wasted.
#82282
A
he realized
B
did he realize
C
he had realized
D
had he realized