单项选择题

The secretary is very diligent; （） she can't get admission of the boss.

A. however
B. therefore
C. so
D. although

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I （） a letter from my sister yesterday.

A. accepted
B. received
C. took up
D. excepted
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Mr. Zhou is （） an excellent professor.

A. even so
B. ever so
C. ever such
D. so far
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