问题

The school rules state that no child shall be allowed out of the school during the day,__________ accompanied by an adult[ ]

A: once
B: when
C: if
D: unless

正确答案是：

同类题型

My brother ______ a soccer ball and I _____one.

In our store,we have jackets _______a very good price.

__ we don’t care about ourselves, we don’t wantour kids to live in a bad environment

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I heard that Tina got an “A” in the last English test—Wow, If she _____ here, she______ very happy .