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I wondered what difficulty he had _____ the plan.
A．to carry outB．carrying outC．carried outD．with carrying out
B

試題分析：考查非謂語動詞。句中he had ____ the plan作定語，這里考查短語have difficulty (in) doing sth.做某事有可能。句意：我想知道他執(zhí)行這個計劃有什么困難。故B正確。
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