单项选择题

Mr. Smith drove slowly on the way home until he reached the highway, () the speed limit was 60 miles an hour.

A. where
B. though
C. when
D. because

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I'm going to have my letters () tomorrow.

A. type
B. typing
C. typed
D. to be typed

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Living in the central Australian desert has its problems, () obtaining water is not the least.

A. of which
B. for what
C. as
D. whose

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