Miss Sullivan clarified the science Project in Simple but vivid language so as to make it easier for teenagers ________.
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A
understanding
B
to understand
C
understood
D
to be understood
推荐题目
The children went home from the grammar school, their lessons __________ for the day.
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A
finishing
B
finished
C
had finished
D
were finished
I had Helen's brother _____ the windows, but Helen had them _____ instead.
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A
to clean； cleaned
B
cleaned； cleaned
C
cleaning； cleaned
D
clean； cleaned
They are forbidden ________,for they are still middle school students.
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A
o smoking
B
o smoke
C
moked
D
moke
People in Nome all had diphtheria, a disease that spreads very fast. If ________, it would produce a powerful poison that would kill the patient.
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A
untreating
B
to untreat
C
untreated
D
untreat
Do you know the Three Gorges Dam is the largest hydro-electric dam ever_______?
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A
constructed
B
constructing
C
to be constructed
D
been constructed