these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.A．SinceB．UnlessC．OnceD．While 题目和参考答案——青夏教育精英家教网—

题目内容

_______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.

A．Since

B．Unless

C．Once

D．While

考查连词：A. Since自从，既然B. Unless除非C. Once一旦D. While当…时候，虽然，句意是：虽然这些硬币形状颜色大小不同，但它们都可追溯到很远很远以前。选D。

练习册系列答案

It ____ we had stayed together for a couple of weeks ____ I found we had a lot in common.

A．was until; when	B．was not until; that
C．was not until; when	D．was until; that

We have decided to fulfill the task in time, difficulties we may meet with.

The school _______ I visited the other day was not the one _______ I once studied.

you make a promise,you should keep it.

There is no doubt _________ the world climate has been changing in recent years.

One more week, ______ we will not accomplish the task.

I didn’t realize my mistake ________ my teacher had a facetoface talk with me.

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