问题

Many people say they love birds, but some plant trees _________ some make cages

A:until
B:though
C:unless
D:while

正确答案是：

同类题型

The professor explained this theoryso clearly that this phenomenon was easy enough ________.

This small seaside village is a perfect place for holidays so thatvisitors never leave it________.[ ]

－Who’s that －

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