单项选择题

The reason (why) Jack (failed) to (attend) the lecture is (because) he had a bad cold.

A. why
B. failed
C. attend
D. because
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No matter (whatever happens), we' re determined (to do our best) and (make) the experiment (a success).
A. whatever happens
B. to do best
C. make
D. a success
单项选择题
Our (city) (has) (the) (most) beautiful park.
A. city
B. has
C. the
D. most
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