所有维生素中,除了VitD 以外,既不能在体内合成,也不能在体内充分储存。
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Mother saved every cent she could spare _______my schooling.
A. to pay for
B. paying for
C. to have paid for
D. paid for
The compositions contained so few errors that the teacher got the students______one another's papers.(1992.TEM-4)
A. correct
B. to correct
C. correcting
D. to be correcting
The three men tried many times to sneak across the border into the neighboring country ______by the police each time.(1999.TEM-4)
A. had been captured
B. being always captured
C. only to be captured
D. unfortunately captured
Some people viewed the findings with caution,noting that a cause-and-effectrelationship between passive smoking and cancer remains______.(1996.1.CET-6)
A. to be shown
B. to have shown
C. to have been shown
D. being shown