You will have to wait for one more week, when the manager back from his trip.
A. will be
B. es
C. is going to be
D. is
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(答案→)A. will be
B. es
C. is going to be
D. is
解析：考查时态。句意：考虑到经理要旅行归来，你不得不在多等一个星期。Be going to表示计划打算发生的动作，will表示自然发生的事情，结合语境可知经理的归来是自然发生的动作，故选A。