He referred his success ________ the good teaching he had had.

______ he referred to in his article was unknown to the general reader.

A. That B. What C. Whether D. Where

______ he referred to in his article was unknown to the general reader.

A. That B. What C. Whether D. Where

The problem he referred to _____ difficult, but is isn’t at all.

A. must be B. seeming C. seems D. seem

he referred to in his article was unknown to the general reader.

A. That B. What C. Whether D. Where

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