The argument remains extremely heated       it is necessary to frequently update teaching material.
A．thatB．whichC．ifD．whether
D
考查同位語(yǔ)從句。根據(jù)the argument和it is necessary to frequently update teaching material為同一內(nèi)容可判斷使用同位語(yǔ)從句并且表示不確定之意，因此使用whether。
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