单项选择题

(Even though) Sandra (has been studying) English for three years (before) she came to the United States, it is difficult for her (to express herself).

A．Even though
B．has been studying
C．before
D．to express herself
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单项选择题
(When) he found he (hadn't) enough money (to pay for) the meal, he was very much (embarrassing).
A．When
B．hadn't
C．to pay for
D．embarrassing
单项选择题
During (the) discussion, Mr. Sam (remained) silent (when) a (sking his opinion).
A．the
B．remained
C．when
D．sking his opinion
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