He talked about the lectures and schools ____ he had visited.
A. that
B. which
C. who
D. whom
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The scientist the teacher is talking ____ is leaving for Beijing.
A. to him
B. whom
C. to
D. to that
I who ____ your teacher, will teach Marxism as a truth to you.
A. is
B. are
C. were
D. am
____ they could do was to work hard.
All
B. All what
C. All which
D. That
It was not ____ he took off his dark glass ____ I realized who he was.
A. when; that
B. until; when
C. when; then
D. until; that