单项选择题

The instructions are too clear on the bottle: These tablets __ they are able to make about twenty different sounds.

A．will be kept
B．are to be kept
C．shall keep
D．shall have kept
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单项选择题
As resident of Texas, Dennis __ to the House of Representatives in 1930 and to the Senate in 1938.
A．when elected
B．elected
C．who was elected
D．was elected
单项选择题
____ millions of galaxies exist in the vast space outside the Milky Way.
A．It is estimated that
B．An estimate that
C．That is estimated
D．That the estimate
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