单选题
Nancy had
a great deal of
trouble
to concentrate on
her work
because of
the noise
in
the next room.
A. a great deal of
B. to concentrate on
C. because of
D. in
A
B
C
D
【正确答案】
B
【答案解析】
应改为concentrating on。have trouble doing sth．做……很困难，固定用法。
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