—Sam，let’s go and play basketball．
—Not now．I ________ Dick with his English．
| A．help |
| B．helped |
| C．am helping |
| D．have helped |
—Sam，let’s go and play basketball．
—Not now．I ________ Dick with his English．
| A．help |
| B．helped |
| C．am helping |
| D．have helped |
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