“Isn’t it about time you _____ to do morning exercises？” “Yes, it is. Would you like to join us？”
| A．begin | B．have begun |
| C．began | D．had begun |
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“Isn’t it about time you _____ to do morning exercises？” “Yes, it is. Would you like to join us？”
| A．begin | B．have begun |
| C．began | D．had begun |
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