Someone is knocking at the door，Is it Tom？
It _____him．He has gone to Beijing．（ ）
| A． |
may not be |
B． |
can't be |
C． |
mustn't be |
Someone is knocking at the door，Is it Tom？
It _____him．He has gone to Beijing．（ ）
| A． |
may not be |
B． |
can't be |
C． |
mustn't be |
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