单项选择题

______no buses, we have to walk home.

A) There being B) It were
C) There were
D) It being
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单项选择题
Just as any other vaccine, LYMErix may also have some side effects such as ______.
A) backache

C) stomachache
B) fever and coughing

D) serious headache
单项选择题
How many species are there on Earth according to most scientists
A) About 2 million.
B) About 10 million.
C) About 100 million.
D) About 1.75 million.
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