问题

Thedesksandseatscanbeusedforalongperiodoftime,they _____theheightofthechildren. [ ]
A: mustbeadjustedto
B: canbeadjustedto
C: mustadjustto
D: canadjustto
B: canbeadjustedto
C: mustadjustto
D: canadjustto
正确答案是:
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