Whenever you need help， just call me． I can come at the drop of a hat．（ ）
| A． |
with a hat |
B． |
without a hat |
| C． |
at once |
D． |
at a low speed |
Whenever you need help， just call me． I can come at the drop of a hat．（ ）
| A． |
with a hat |
B． |
without a hat |
| C． |
at once |
D． |
at a low speed |
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