问题

_, I cannot accept yourinvitation Hopefully, we’ll get together some time next year

A:Before
B:Whether
C:Unless
D:While

正确答案是：

同类题型

The SARS will _________ quickly if we don’t pay much attention to it.

_________，so he didn’t come to school last week.

ing to IQ scores, you are smartest from 18 t025, but you’re wiser andmoreexperienced _______ increasing age.

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