题文
will Mr．Brown be back？
In an hour．（ ）
| A． |
How long |
B． |
How often |
C． |
How soon |
D． |
How much |
will Mr．Brown be back？
In an hour．（ ）
| A． |
How long |
B． |
How often |
C． |
How soon |
D． |
How much |
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