单项选择题

(That) troubles me is (that) I can't learn (all these) English idioms (by heart).

A．That
B．that
C．all these
D．by heart
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单项选择题
In order to (attain) our objective, it is (essential) that we (will make) the best use of the limited resources (available).
A．attain
B．essential
C．will make
D．available
单项选择题
He (has died) (for years), (so) (almost nobody) knows him.
A．has died
B．for years
C．so
D．almost nobody
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