_____you smell something burning？ Go and see what's happening．（ ）
| A． |
Can |
B． |
May |
C． |
Must |
D． |
Need |
_____you smell something burning？ Go and see what's happening．（ ）
| A． |
Can |
B． |
May |
C． |
Must |
D． |
Need |
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