单项选择题

He did nothing but ______ letters home all this afternoon.

A. to write
B. writing
C. write
D. wrote
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单项选择题
Most of the earliest ______ into America came from Europe.
A. migrants
B. emigrants
C. immigrants
D. inhabitants
单项选择题
We will visit Europe next year ______ we have enough money.
A. lest
B. until
C. unless
D. provided
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