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
【正确答案】
B
【答案解析】
[解析] 应改为concentrating on。have trouble (in) doing sth：做什么事情有麻烦。
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