单项选择题

The main problem right now is（）I have enough time.

A．that
B．whether
C．if
D．which

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单项选择题

The old man and his dog were（）to each other.

A．helped
B．attached
C．formed
D．engaged

单项选择题

（） better condition, the flowers could have grown better.

A．Giving
B．Having given
C．Given
D．Give

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