—Mom, my classmates invited me ____ a field trip. May I go with them?
—OK.
| A．go on | B．to go on | C．go in | D．to go in |
—Mom, my classmates invited me ____ a field trip. May I go with them?
—OK.
| A．go on | B．to go on | C．go in | D．to go in |
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