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【单选题】
为他人做介绍社交基本原则不正确的是（ ）。A.
将职位低的介绍给职位高的
B.
将迟到者介绍给早到者
C.
将已婚的介绍给未婚的
D.
将客人介绍给主人
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皮皮学刷刷变学霸
举一反三
【单选题】I never seem to lose any weight, __________I try hard.
A.
even though
B.
no matter how
C.
as if
D.
ever since
【单选题】Mr. Black has been teaching English in a middle school _____ he came to China.
A.
for ever
B.
ever since
C.
since then
D.
long before
【简答题】已知△ABC，∠B=60°，且sinA-sinC+ 2 2 cos（A-C）= 2 2 ．求sinC的值．
【单选题】______ you have finished your work, you are free to do what you like.
A.
Now that
B.
Ever since
C.
For now
D.
By now
【判断题】在T细胞活化过程中，所需协同刺激信号主要是通过T细胞表面的B7分子与APC表面的CD28分子结合而提供；在B细胞活化过程中，所需协同刺激信号主要是通过B细胞表面的CD40分子与Th细胞表面的CD40L分子结合而提供。
A.
正确
B.
错误
【单选题】—How long have you been working as an assistant here? —__________I finished middle school.
A.
Ever since
B.
Before
C.
After
D.
When
【单选题】You must be strict with your children _____________.
A.
in the future
B.
in future
C.
from now
D.
ever since
【简答题】△ABC中，若（sinA+sinB+sinC）（sinA+sinB-sinC）=3sinAsinB，则C=______．
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