Usually I don't allow________in my office，but yesterday I allowed him________ here.
| A．smoking；to smoke | B．smoking；smoking |
| C．to smoke；smoking | D．to smoke；to smoke |
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Usually I don't allow________in my office，but yesterday I allowed him________ here.
| A．smoking；to smoke | B．smoking；smoking |
| C．to smoke；smoking | D．to smoke；to smoke |
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