They don’t know how able a poor youngster might have been______ he grown up under more favorable circumstances.

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问题 They don’t know how able a poor youngster might have been______ he grown up under more favorable circumstances.

选项 A、if
B、had
C、and
D、has

答案B

解析 如果选择连词if或者and,那么句子成分就不完整,故排除掉(A)和(C)。
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