Amy ______ better last night, but she was a little nervous and didn’t reach her best standard.
| A．could perform | B．must have performed |
| C．should perform | D．could have performed |
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Amy ______ better last night, but she was a little nervous and didn’t reach her best standard.
| A．could perform | B．must have performed |
| C．should perform | D．could have performed |
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