单项选择题

There is nothing to do but ______ the experiment.

A. to repeat
B. repeating
C. repeats
D. repeat
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单项选择题
______ was to return to school.
A. That really interested him

B. What really interested him
C. Which really interested him

D. That interested him really
单项选择题
Poor ______ he is, he remains honest and kind.
A. as
B. however
C. because
D. although
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