单项选择题

The earth is nearly ______ the moon.

A．50 time the size of
B．50 times the size of
C．50 times as size as
D．50 times as that of
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单项选择题
Before the first non-stop flight made in 1949, it ______ necessary for all planes to land for refueling.
A．would be
B．has been
C．had been
D．would have been
单项选择题
______the old man's sons wanted to know was ______ the gold had been hidden.
A．That, what
B．What, where
C．What, that
D．What, if
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