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题型：单选题题类：模拟题难易度：普通

Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.

A、only if B、until C、so that D、even though

举一反三

- I can hardly believe my eyes. Is that you, Joy?

- Yes. It has been almost ten years we were together.

用and, or, but填空。

—I don't know where．to spend my summer holiday．

—You can go to Japan， you can go to America．

They went to the playground and practiced running they could win the race.

Is it new _________ old, Li Ming?

The battle continued for several hours ___________ darkness came on.

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