---What _____useful book !
---Yes, it is. But I find it ______ difficult for me to read.
| A．an, very | B．a, too | C．an, too | D．a, quite |
---What _____useful book !
---Yes, it is. But I find it ______ difficult for me to read.
| A．an, very | B．a, too | C．an, too | D．a, quite |
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