It’s rude to laugh ______ others when they have trouble ______ something.
| A．at; do | B．to; doing |
| C．with ; to do | D．at ;doing |
It’s rude to laugh ______ others when they have trouble ______ something.
| A．at; do | B．to; doing |
| C．with ; to do | D．at ;doing |
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