he said he would ring me up but he didn’t my telephone number?A. Has he forgottenB. Must

问题补充：

he said he would ring me up, but he didn’t my telephone number?

A. Has he forgotten

B. Must he forget

C. Must he have forgotten

D. Could he have forgotten

答案：

A. Has he forgotten

B. Must he forget

C. Must he have forgotten

(答案→)D. Could he have forgotten

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