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
Jonnie (was not) barely able to walk (without help) (because of) the (bad) injury in his left leg.
A. was not
B. without help
C. because of
D. bad
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
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