单项选择题

(Even though) Sedat (has been studying) English for three years before he came (to the United States), It is still difficult for him (to express himself).

A．Even though
B．has been studying
C．to the United States
D．to express himself
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(Find answers) (to) these question (is) something (like) a detective story.
A．Find answers
B．to
C．is
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A student is (allowed) to (enter into) this room (only if) a teacher (has) given permission.
A．allowed
B．enter into
C．only if
D．has
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