一个功能对它的上位功能来说是手段,对它的下位功能来说又是目的。
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1)______can help build us the bodies.
A. To swimming
B. Swam
C. Swimming
D. To swim
_______the midnight oil makes people lose their spirits at work.
A. Burned
Burning
C. To burn
D. Burns
_____ these problems may be more complicated than we think.
A. Solving
B. Solve
C. Be solved
D. Solved
As college students__in exams is a rule we must abide by.
A. cheat
B. cheating
C. not cheating
D. not cheated