4.Occasions are quite rare ______ I have the time to spend a day with the kids.
| A．who | B．which | C．why | D．when |
相关试题
We are invited to a party _________in our club next Friday.
| A．to be held | B．held | C．being held | D．holding |
----John and I will celebrate our fortieth wedding anniversary next month.
-----Oh, _________!
| A．cheer up | B．well done | C．go ahead | D．congratulations |
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